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gstreamer/gst/rtpmanager/gstrtpjitterbuffer.c
Wim Taymans 00056965e8 rtpjitterbuffer: fix race when updating the next_seqnum 
If we were not waiting for the missing seqnum when we insert the lost packet
event in the jitterbuffer, we end up not updating the next_seqnum and wait
forever for the lost packets to arrive. Instead, keep track of the amount of
packets contained by the jitterbuffer item and update the next expected
seqnum only after pushing the buffer/event. This makes sure we correctly handle
GAPS in the sequence numbers.
2013-09-30 12:31:00 +02:00

3210 lines
98 KiB
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/*
* Farsight Voice+Video library
*
* Copyright 2007 Collabora Ltd,
* Copyright 2007 Nokia Corporation
* @author: Philippe Kalaf <philippe.kalaf@collabora.co.uk>.
* Copyright 2007 Wim Taymans <wim.taymans@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
/**
* SECTION:element-rtpjitterbuffer
*
* This element reorders and removes duplicate RTP packets as they are received
* from a network source.
*
* The element needs the clock-rate of the RTP payload in order to estimate the
* delay. This information is obtained either from the caps on the sink pad or,
* when no caps are present, from the #GstRtpJitterBuffer::request-pt-map signal.
* To clear the previous pt-map use the #GstRtpJitterBuffer::clear-pt-map signal.
*
* The rtpjitterbuffer will wait for missing packets up to a configurable time
* limit using the #GstRtpJitterBuffer:latency property. Packets arriving too
* late are considered to be lost packets. If the #GstRtpJitterBuffer:do-lost
* property is set, lost packets will result in a custom serialized downstream
* event of name GstRTPPacketLost. The lost packet events are usually used by a
* depayloader or other element to create concealment data or some other logic
* to gracefully handle the missing packets.
*
* The jitterbuffer will use the DTS (or PTS if no DTS is set) of the incomming
* buffer and the rtptime inside the RTP packet to create a PTS on the outgoing
* buffer.
*
* The jitterbuffer can also be configured to send early retransmission events
* upstream by setting the #GstRtpJitterBuffer:do-retransmission property. In
* this mode, the jitterbuffer tries to estimate when a packet should arrive and
* sends a custom upstream event named GstRTPRetransmissionRequest when the
* packet is considered late. The initial expected packet arrival time is
* calculated as follows:
*
* - If seqnum N arrived at time T, seqnum N+1 is expected to arrive at
* T + packet-spacing + #GstRtpJitterBuffer:rtx-delay. The packet spacing is
* calculated from the DTS (or PTS is no DTS) of two consecutive RTP
* packets with different rtptime.
*
* - If seqnum N0 arrived at time T0 and seqnum Nm arrived at time Tm,
* seqnum Ni is expected at time Ti = T0 + i*(Tm - T0)/(Nm - N0). Any
* previously scheduled timeout is overwritten.
*
* - If seqnum N arrived, all seqnum older than
* N - #GstRtpJitterBuffer:rtx-delay-reorder are considered late
* immediately. This is to request fast feedback for abonormally reorder
* packets before any of the previous timeouts is triggered.
*
* A late packet triggers the GstRTPRetransmissionRequest custom upstream
* event. After the initial timeout expires and the retransmission event is
* sent, the timeout is scheduled for
* T + #GstRtpJitterBuffer:rtx-retry-timeout. If the missing packet did not
* arrive after #GstRtpJitterBuffer:rtx-retry-timeout, a new
* GstRTPRetransmissionRequest is sent upstream and the timeout is rescheduled
* again for T + #GstRtpJitterBuffer:rtx-retry-timeout. This repeats until
* #GstRtpJitterBuffer:rtx-retry-period elapsed, at which point no further
* retransmission requests are sent and the regular logic is performed to
* schedule a lost packet as discussed above.
*
* This element acts as a live element and so adds #GstRtpJitterBuffer:latency
* to the pipeline.
*
* This element will automatically be used inside rtpbin.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch-1.0 rtspsrc location=rtsp://192.168.1.133:8554/mpeg1or2AudioVideoTest ! rtpjitterbuffer ! rtpmpvdepay ! mpeg2dec ! xvimagesink
* ]| Connect to a streaming server and decode the MPEG video. The jitterbuffer is
* inserted into the pipeline to smooth out network jitter and to reorder the
* out-of-order RTP packets.
* </refsect2>
*
* Last reviewed on 2007-05-28 (0.10.5)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <gst/rtp/gstrtpbuffer.h>
#include "gstrtpjitterbuffer.h"
#include "rtpjitterbuffer.h"
#include "rtpstats.h"
#include <gst/glib-compat-private.h>
GST_DEBUG_CATEGORY (rtpjitterbuffer_debug);
#define GST_CAT_DEFAULT (rtpjitterbuffer_debug)
/* RTPJitterBuffer signals and args */
enum
{
SIGNAL_REQUEST_PT_MAP,
SIGNAL_CLEAR_PT_MAP,
SIGNAL_HANDLE_SYNC,
SIGNAL_ON_NPT_STOP,
SIGNAL_SET_ACTIVE,
LAST_SIGNAL
};
#define DEFAULT_LATENCY_MS 200
#define DEFAULT_DROP_ON_LATENCY FALSE
#define DEFAULT_TS_OFFSET 0
#define DEFAULT_DO_LOST FALSE
#define DEFAULT_MODE RTP_JITTER_BUFFER_MODE_SLAVE
#define DEFAULT_PERCENT 0
#define DEFAULT_DO_RETRANSMISSION FALSE
#define DEFAULT_RTX_DELAY 20
#define DEFAULT_RTX_DELAY_REORDER 3
#define DEFAULT_RTX_RETRY_TIMEOUT 40
#define DEFAULT_RTX_RETRY_PERIOD 160
enum
{
PROP_0,
PROP_LATENCY,
PROP_DROP_ON_LATENCY,
PROP_TS_OFFSET,
PROP_DO_LOST,
PROP_MODE,
PROP_PERCENT,
PROP_DO_RETRANSMISSION,
PROP_RTX_DELAY,
PROP_RTX_DELAY_REORDER,
PROP_RTX_RETRY_TIMEOUT,
PROP_RTX_RETRY_PERIOD,
PROP_LAST
};
#define JBUF_LOCK(priv) (g_mutex_lock (&(priv)->jbuf_lock))
#define JBUF_LOCK_CHECK(priv,label) G_STMT_START { \
JBUF_LOCK (priv); \
if (G_UNLIKELY (priv->srcresult != GST_FLOW_OK)) \
goto label; \
} G_STMT_END
#define JBUF_UNLOCK(priv) (g_mutex_unlock (&(priv)->jbuf_lock))
#define JBUF_WAIT_TIMER(priv) G_STMT_START { \
GST_DEBUG ("waiting timer"); \
(priv)->waiting_timer = TRUE; \
g_cond_wait (&(priv)->jbuf_timer, &(priv)->jbuf_lock); \
(priv)->waiting_timer = FALSE; \
GST_DEBUG ("waiting timer done"); \
} G_STMT_END
#define JBUF_SIGNAL_TIMER(priv) G_STMT_START { \
if (G_UNLIKELY ((priv)->waiting_timer)) { \
GST_DEBUG ("signal timer"); \
g_cond_signal (&(priv)->jbuf_timer); \
} \
} G_STMT_END
#define JBUF_WAIT_EVENT(priv,label) G_STMT_START { \
GST_DEBUG ("waiting event"); \
(priv)->waiting_event = TRUE; \
g_cond_wait (&(priv)->jbuf_event, &(priv)->jbuf_lock); \
(priv)->waiting_event = FALSE; \
GST_DEBUG ("waiting event done"); \
if (G_UNLIKELY (priv->srcresult != GST_FLOW_OK)) \
goto label; \
} G_STMT_END
#define JBUF_SIGNAL_EVENT(priv) G_STMT_START { \
if (G_UNLIKELY ((priv)->waiting_event)) { \
GST_DEBUG ("signal event"); \
g_cond_signal (&(priv)->jbuf_event); \
} \
} G_STMT_END
struct _GstRtpJitterBufferPrivate
{
GstPad *sinkpad, *srcpad;
GstPad *rtcpsinkpad;
RTPJitterBuffer *jbuf;
GMutex jbuf_lock;
gboolean waiting_timer;
GCond jbuf_timer;
gboolean waiting_event;
GCond jbuf_event;
gboolean discont;
gboolean ts_discont;
gboolean active;
guint64 out_offset;
gboolean timer_running;
GThread *timer_thread;
/* properties */
guint latency_ms;
guint64 latency_ns;
gboolean drop_on_latency;
gint64 ts_offset;
gboolean do_lost;
gboolean do_retransmission;
gint rtx_delay;
gint rtx_delay_reorder;
gint rtx_retry_timeout;
gint rtx_retry_period;
/* the last seqnum we pushed out */
guint32 last_popped_seqnum;
/* the next expected seqnum we push */
guint32 next_seqnum;
/* last output time */
GstClockTime last_out_time;
/* last valid input timestamp and rtptime pair */
GstClockTime ips_dts;
guint64 ips_rtptime;
GstClockTime packet_spacing;
/* the next expected seqnum we receive */
GstClockTime last_in_dts;
guint32 last_in_seqnum;
guint32 next_in_seqnum;
GArray *timers;
/* start and stop ranges */
GstClockTime npt_start;
GstClockTime npt_stop;
guint64 ext_timestamp;
guint64 last_elapsed;
guint64 estimated_eos;
GstClockID eos_id;
/* state */
gboolean eos;
/* clock rate and rtp timestamp offset */
gint last_pt;
gint32 clock_rate;
gint64 clock_base;
gint64 prev_ts_offset;
/* when we are shutting down */
GstFlowReturn srcresult;
gboolean blocked;
/* for sync */
GstSegment segment;
GstClockID clock_id;
GstClockTime timer_timeout;
guint16 timer_seqnum;
/* the latency of the upstream peer, we have to take this into account when
* synchronizing the buffers. */
GstClockTime peer_latency;
guint64 ext_rtptime;
GstBuffer *last_sr;
/* some accounting */
guint64 num_late;
guint64 num_duplicates;
guint64 num_rtx_requests;
guint64 num_rtx_success;
guint64 num_rtx_failed;
gdouble avg_rtx_num;
guint64 avg_rtx_rtt;
};
typedef enum
{
TIMER_TYPE_EXPECTED,
TIMER_TYPE_LOST,
TIMER_TYPE_DEADLINE,
TIMER_TYPE_EOS
} TimerType;
typedef struct
{
guint idx;
guint16 seqnum;
guint num;
TimerType type;
GstClockTime timeout;
GstClockTime duration;
GstClockTime rtx_base;
GstClockTime rtx_delay;
GstClockTime rtx_retry;
GstClockTime rtx_last;
guint num_rtx_retry;
} TimerData;
#define GST_RTP_JITTER_BUFFER_GET_PRIVATE(o) \
(G_TYPE_INSTANCE_GET_PRIVATE ((o), GST_TYPE_RTP_JITTER_BUFFER, \
GstRtpJitterBufferPrivate))
static GstStaticPadTemplate gst_rtp_jitter_buffer_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"clock-rate = (int) [ 1, 2147483647 ]"
/* "payload = (int) , "
* "encoding-name = (string) "
*/ )
);
static GstStaticPadTemplate gst_rtp_jitter_buffer_sink_rtcp_template =
GST_STATIC_PAD_TEMPLATE ("sink_rtcp",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("application/x-rtcp")
);
static GstStaticPadTemplate gst_rtp_jitter_buffer_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp"
/* "payload = (int) , "
* "clock-rate = (int) , "
* "encoding-name = (string) "
*/ )
);
static guint gst_rtp_jitter_buffer_signals[LAST_SIGNAL] = { 0 };
#define gst_rtp_jitter_buffer_parent_class parent_class
G_DEFINE_TYPE (GstRtpJitterBuffer, gst_rtp_jitter_buffer, GST_TYPE_ELEMENT);
/* object overrides */
static void gst_rtp_jitter_buffer_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_rtp_jitter_buffer_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static void gst_rtp_jitter_buffer_finalize (GObject * object);
/* element overrides */
static GstStateChangeReturn gst_rtp_jitter_buffer_change_state (GstElement
* element, GstStateChange transition);
static GstPad *gst_rtp_jitter_buffer_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name, const GstCaps * filter);
static void gst_rtp_jitter_buffer_release_pad (GstElement * element,
GstPad * pad);
static GstClock *gst_rtp_jitter_buffer_provide_clock (GstElement * element);
/* pad overrides */
static GstCaps *gst_rtp_jitter_buffer_getcaps (GstPad * pad, GstCaps * filter);
static GstIterator *gst_rtp_jitter_buffer_iterate_internal_links (GstPad * pad,
GstObject * parent);
/* sinkpad overrides */
static gboolean gst_rtp_jitter_buffer_sink_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static GstFlowReturn gst_rtp_jitter_buffer_chain (GstPad * pad,
GstObject * parent, GstBuffer * buffer);
static gboolean gst_rtp_jitter_buffer_sink_rtcp_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static GstFlowReturn gst_rtp_jitter_buffer_chain_rtcp (GstPad * pad,
GstObject * parent, GstBuffer * buffer);
static gboolean gst_rtp_jitter_buffer_sink_query (GstPad * pad,
GstObject * parent, GstQuery * query);
/* srcpad overrides */
static gboolean gst_rtp_jitter_buffer_src_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_rtp_jitter_buffer_src_activate_mode (GstPad * pad,
GstObject * parent, GstPadMode mode, gboolean active);
static void gst_rtp_jitter_buffer_loop (GstRtpJitterBuffer * jitterbuffer);
static gboolean gst_rtp_jitter_buffer_src_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static void
gst_rtp_jitter_buffer_clear_pt_map (GstRtpJitterBuffer * jitterbuffer);
static GstClockTime
gst_rtp_jitter_buffer_set_active (GstRtpJitterBuffer * jitterbuffer,
gboolean active, guint64 base_time);
static void do_handle_sync (GstRtpJitterBuffer * jitterbuffer);
static void unschedule_current_timer (GstRtpJitterBuffer * jitterbuffer);
static void remove_all_timers (GstRtpJitterBuffer * jitterbuffer);
static void wait_next_timeout (GstRtpJitterBuffer * jitterbuffer);
static void
gst_rtp_jitter_buffer_class_init (GstRtpJitterBufferClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
g_type_class_add_private (klass, sizeof (GstRtpJitterBufferPrivate));
gobject_class->finalize = gst_rtp_jitter_buffer_finalize;
gobject_class->set_property = gst_rtp_jitter_buffer_set_property;
gobject_class->get_property = gst_rtp_jitter_buffer_get_property;
/**
* GstRtpJitterBuffer::latency:
*
* The maximum latency of the jitterbuffer. Packets will be kept in the buffer
* for at most this time.
*/
g_object_class_install_property (gobject_class, PROP_LATENCY,
g_param_spec_uint ("latency", "Buffer latency in ms",
"Amount of ms to buffer", 0, G_MAXUINT, DEFAULT_LATENCY_MS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpJitterBuffer::drop-on-latency:
*
* Drop oldest buffers when the queue is completely filled.
*/
g_object_class_install_property (gobject_class, PROP_DROP_ON_LATENCY,
g_param_spec_boolean ("drop-on-latency",
"Drop buffers when maximum latency is reached",
"Tells the jitterbuffer to never exceed the given latency in size",
DEFAULT_DROP_ON_LATENCY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpJitterBuffer::ts-offset:
*
* Adjust GStreamer output buffer timestamps in the jitterbuffer with offset.
* This is mainly used to ensure interstream synchronisation.
*/
g_object_class_install_property (gobject_class, PROP_TS_OFFSET,
g_param_spec_int64 ("ts-offset", "Timestamp Offset",
"Adjust buffer timestamps with offset in nanoseconds", G_MININT64,
G_MAXINT64, DEFAULT_TS_OFFSET,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpJitterBuffer::do-lost:
*
* Send out a GstRTPPacketLost event downstream when a packet is considered
* lost.
*/
g_object_class_install_property (gobject_class, PROP_DO_LOST,
g_param_spec_boolean ("do-lost", "Do Lost",
"Send an event downstream when a packet is lost", DEFAULT_DO_LOST,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpJitterBuffer::mode:
*
* Control the buffering and timestamping mode used by the jitterbuffer.
*/
g_object_class_install_property (gobject_class, PROP_MODE,
g_param_spec_enum ("mode", "Mode",
"Control the buffering algorithm in use", RTP_TYPE_JITTER_BUFFER_MODE,
DEFAULT_MODE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpJitterBuffer::percent:
*
* The percent of the jitterbuffer that is filled.
*
* Since: 0.10.19
*/
g_object_class_install_property (gobject_class, PROP_PERCENT,
g_param_spec_int ("percent", "percent",
"The buffer filled percent", 0, 100,
0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpJitterBuffer::do-retransmission:
*
* Send out a GstRTPRetransmission event upstream when a packet is considered
* late and should be retransmitted.
*
* Since: 1.2
*/
g_object_class_install_property (gobject_class, PROP_DO_RETRANSMISSION,
g_param_spec_boolean ("do-retransmission", "Do Retransmission",
"Send retransmission events upstream when a packet is late",
DEFAULT_DO_RETRANSMISSION,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpJitterBuffer::rtx-delay:
*
* When a packet did not arrive at the expected time, wait this extra amount
* of time before sending a retransmission event.
*
* When -1 is used, the max jitter will be used as extra delay.
*
* Since: 1.2
*/
g_object_class_install_property (gobject_class, PROP_RTX_DELAY,
g_param_spec_int ("rtx-delay", "RTX Delay",
"Extra time in ms to wait before sending retransmission "
"event (-1 automatic)", -1, G_MAXINT, DEFAULT_RTX_DELAY,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpJitterBuffer::rtx-delay-reorder:
*
* Assume that a retransmission event should be sent when we see
* this much packet reordering.
*
* When -1 is used, the value will be estimated based on observed packet
* reordering.
*
* Since: 1.2
*/
g_object_class_install_property (gobject_class, PROP_RTX_DELAY_REORDER,
g_param_spec_int ("rtx-delay-reorder", "RTX Delay Reorder",
"Sending retransmission event when this much reordering (-1 automatic)",
-1, G_MAXINT, DEFAULT_RTX_DELAY_REORDER,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpJitterBuffer::rtx-retry-timeout:
*
* When no packet has been received after sending a retransmission event
* for this time, retry sending a retransmission event.
*
* When -1 is used, the value will be estimated based on observed round
* trip time.
*
* Since: 1.2
*/
g_object_class_install_property (gobject_class, PROP_RTX_RETRY_TIMEOUT,
g_param_spec_int ("rtx-retry-timeout", "RTX Retry Timeout",
"Retry sending a transmission event after this timeout in "
"ms (-1 automatic)", -1, G_MAXINT, DEFAULT_RTX_RETRY_TIMEOUT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpJitterBuffer::rtx-retry-period:
*
* The amount of time to try to get a retransmission.
*
* When -1 is used, the value will be estimated based on the jitterbuffer
* latency and the observed round trip time.
*
* Since: 1.2
*/
g_object_class_install_property (gobject_class, PROP_RTX_RETRY_PERIOD,
g_param_spec_int ("rtx-retry-period", "RTX Retry Period",
"Try to get a retransmission for this many ms "
"(-1 automatic)", -1, G_MAXINT, DEFAULT_RTX_RETRY_PERIOD,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpJitterBuffer::request-pt-map:
* @buffer: the object which received the signal
* @pt: the pt
*
* Request the payload type as #GstCaps for @pt.
*/
gst_rtp_jitter_buffer_signals[SIGNAL_REQUEST_PT_MAP] =
g_signal_new ("request-pt-map", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpJitterBufferClass,
request_pt_map), NULL, NULL, g_cclosure_marshal_generic,
GST_TYPE_CAPS, 1, G_TYPE_UINT);
/**
* GstRtpJitterBuffer::handle-sync:
* @buffer: the object which received the signal
* @struct: a GstStructure containing sync values.
*
* Be notified of new sync values.
*/
gst_rtp_jitter_buffer_signals[SIGNAL_HANDLE_SYNC] =
g_signal_new ("handle-sync", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpJitterBufferClass,
handle_sync), NULL, NULL, g_cclosure_marshal_VOID__BOXED,
G_TYPE_NONE, 1, GST_TYPE_STRUCTURE | G_SIGNAL_TYPE_STATIC_SCOPE);
/**
* GstRtpJitterBuffer::on-npt-stop
* @buffer: the object which received the signal
*
* Signal that the jitterbufer has pushed the RTP packet that corresponds to
* the npt-stop position.
*/
gst_rtp_jitter_buffer_signals[SIGNAL_ON_NPT_STOP] =
g_signal_new ("on-npt-stop", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpJitterBufferClass,
on_npt_stop), NULL, NULL, g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0, G_TYPE_NONE);
/**
* GstRtpJitterBuffer::clear-pt-map:
* @buffer: the object which received the signal
*
* Invalidate the clock-rate as obtained with the
* #GstRtpJitterBuffer::request-pt-map signal.
*/
gst_rtp_jitter_buffer_signals[SIGNAL_CLEAR_PT_MAP] =
g_signal_new ("clear-pt-map", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GstRtpJitterBufferClass, clear_pt_map), NULL, NULL,
g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0, G_TYPE_NONE);
/**
* GstRtpJitterBuffer::set-active:
* @buffer: the object which received the signal
*
* Start pushing out packets with the given base time. This signal is only
* useful in buffering mode.
*
* Returns: the time of the last pushed packet.
*
* Since: 0.10.19
*/
gst_rtp_jitter_buffer_signals[SIGNAL_SET_ACTIVE] =
g_signal_new ("set-active", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GstRtpJitterBufferClass, set_active), NULL, NULL,
g_cclosure_marshal_generic, G_TYPE_UINT64, 2, G_TYPE_BOOLEAN,
G_TYPE_UINT64);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_change_state);
gstelement_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_request_new_pad);
gstelement_class->release_pad =
GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_release_pad);
gstelement_class->provide_clock =
GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_provide_clock);
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_jitter_buffer_src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_jitter_buffer_sink_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_jitter_buffer_sink_rtcp_template));
gst_element_class_set_static_metadata (gstelement_class,
"RTP packet jitter-buffer", "Filter/Network/RTP",
"A buffer that deals with network jitter and other transmission faults",
"Philippe Kalaf <philippe.kalaf@collabora.co.uk>, "
"Wim Taymans <wim.taymans@gmail.com>");
klass->clear_pt_map = GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_clear_pt_map);
klass->set_active = GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_set_active);
GST_DEBUG_CATEGORY_INIT
(rtpjitterbuffer_debug, "rtpjitterbuffer", 0, "RTP Jitter Buffer");
}
static void
gst_rtp_jitter_buffer_init (GstRtpJitterBuffer * jitterbuffer)
{
GstRtpJitterBufferPrivate *priv;
priv = GST_RTP_JITTER_BUFFER_GET_PRIVATE (jitterbuffer);
jitterbuffer->priv = priv;
priv->latency_ms = DEFAULT_LATENCY_MS;
priv->latency_ns = priv->latency_ms * GST_MSECOND;
priv->drop_on_latency = DEFAULT_DROP_ON_LATENCY;
priv->do_lost = DEFAULT_DO_LOST;
priv->do_retransmission = DEFAULT_DO_RETRANSMISSION;
priv->rtx_delay = DEFAULT_RTX_DELAY;
priv->rtx_delay_reorder = DEFAULT_RTX_DELAY_REORDER;
priv->rtx_retry_timeout = DEFAULT_RTX_RETRY_TIMEOUT;
priv->rtx_retry_period = DEFAULT_RTX_RETRY_PERIOD;
priv->timers = g_array_new (FALSE, TRUE, sizeof (TimerData));
priv->jbuf = rtp_jitter_buffer_new ();
g_mutex_init (&priv->jbuf_lock);
g_cond_init (&priv->jbuf_timer);
g_cond_init (&priv->jbuf_event);
/* reset skew detection initialy */
rtp_jitter_buffer_reset_skew (priv->jbuf);
rtp_jitter_buffer_set_delay (priv->jbuf, priv->latency_ns);
rtp_jitter_buffer_set_buffering (priv->jbuf, FALSE);
priv->active = TRUE;
priv->srcpad =
gst_pad_new_from_static_template (&gst_rtp_jitter_buffer_src_template,
"src");
gst_pad_set_activatemode_function (priv->srcpad,
GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_src_activate_mode));
gst_pad_set_query_function (priv->srcpad,
GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_src_query));
gst_pad_set_event_function (priv->srcpad,
GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_src_event));
priv->sinkpad =
gst_pad_new_from_static_template (&gst_rtp_jitter_buffer_sink_template,
"sink");
gst_pad_set_chain_function (priv->sinkpad,
GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_chain));
gst_pad_set_event_function (priv->sinkpad,
GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_sink_event));
gst_pad_set_query_function (priv->sinkpad,
GST_DEBUG_FUNCPTR (gst_rtp_jitter_buffer_sink_query));
gst_element_add_pad (GST_ELEMENT (jitterbuffer), priv->srcpad);
gst_element_add_pad (GST_ELEMENT (jitterbuffer), priv->sinkpad);
GST_OBJECT_FLAG_SET (jitterbuffer, GST_ELEMENT_FLAG_PROVIDE_CLOCK);
}
#define ITEM_TYPE_BUFFER 0
#define ITEM_TYPE_LOST 1
static RTPJitterBufferItem *
alloc_item (gpointer data, guint type, GstClockTime dts, GstClockTime pts,
guint seqnum, guint count, guint rtptime)
{
RTPJitterBufferItem *item;
item = g_slice_new (RTPJitterBufferItem);
item->data = data;
item->next = NULL;
item->prev = NULL;
item->type = type;
item->dts = dts;
item->pts = pts;
item->seqnum = seqnum;
item->count = count;
item->rtptime = rtptime;
return item;
}
static void
free_item (RTPJitterBufferItem * item)
{
if (item->data)
gst_mini_object_unref (item->data);
g_slice_free (RTPJitterBufferItem, item);
}
static void
gst_rtp_jitter_buffer_finalize (GObject * object)
{
GstRtpJitterBuffer *jitterbuffer;
GstRtpJitterBufferPrivate *priv;
jitterbuffer = GST_RTP_JITTER_BUFFER (object);
priv = jitterbuffer->priv;
g_array_free (priv->timers, TRUE);
g_mutex_clear (&priv->jbuf_lock);
g_cond_clear (&priv->jbuf_timer);
g_cond_clear (&priv->jbuf_event);
rtp_jitter_buffer_flush (priv->jbuf, (GFunc) free_item, NULL);
g_object_unref (priv->jbuf);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstIterator *
gst_rtp_jitter_buffer_iterate_internal_links (GstPad * pad, GstObject * parent)
{
GstRtpJitterBuffer *jitterbuffer;
GstPad *otherpad = NULL;
GstIterator *it;
GValue val = { 0, };
jitterbuffer = GST_RTP_JITTER_BUFFER (parent);
if (pad == jitterbuffer->priv->sinkpad) {
otherpad = jitterbuffer->priv->srcpad;
} else if (pad == jitterbuffer->priv->srcpad) {
otherpad = jitterbuffer->priv->sinkpad;
} else if (pad == jitterbuffer->priv->rtcpsinkpad) {
otherpad = NULL;
}
g_value_init (&val, GST_TYPE_PAD);
g_value_set_object (&val, otherpad);
it = gst_iterator_new_single (GST_TYPE_PAD, &val);
g_value_unset (&val);
return it;
}
static GstPad *
create_rtcp_sink (GstRtpJitterBuffer * jitterbuffer)
{
GstRtpJitterBufferPrivate *priv;
priv = jitterbuffer->priv;
GST_DEBUG_OBJECT (jitterbuffer, "creating RTCP sink pad");
priv->rtcpsinkpad =
gst_pad_new_from_static_template
(&gst_rtp_jitter_buffer_sink_rtcp_template, "sink_rtcp");
gst_pad_set_chain_function (priv->rtcpsinkpad,
gst_rtp_jitter_buffer_chain_rtcp);
gst_pad_set_event_function (priv->rtcpsinkpad,
(GstPadEventFunction) gst_rtp_jitter_buffer_sink_rtcp_event);
gst_pad_set_iterate_internal_links_function (priv->rtcpsinkpad,
gst_rtp_jitter_buffer_iterate_internal_links);
gst_pad_set_active (priv->rtcpsinkpad, TRUE);
gst_element_add_pad (GST_ELEMENT_CAST (jitterbuffer), priv->rtcpsinkpad);
return priv->rtcpsinkpad;
}
static void
remove_rtcp_sink (GstRtpJitterBuffer * jitterbuffer)
{
GstRtpJitterBufferPrivate *priv;
priv = jitterbuffer->priv;
GST_DEBUG_OBJECT (jitterbuffer, "removing RTCP sink pad");
gst_pad_set_active (priv->rtcpsinkpad, FALSE);
gst_element_remove_pad (GST_ELEMENT_CAST (jitterbuffer), priv->rtcpsinkpad);
priv->rtcpsinkpad = NULL;
}
static GstPad *
gst_rtp_jitter_buffer_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name, const GstCaps * filter)
{
GstRtpJitterBuffer *jitterbuffer;
GstElementClass *klass;
GstPad *result;
GstRtpJitterBufferPrivate *priv;
g_return_val_if_fail (templ != NULL, NULL);
g_return_val_if_fail (GST_IS_RTP_JITTER_BUFFER (element), NULL);
jitterbuffer = GST_RTP_JITTER_BUFFER (element);
priv = jitterbuffer->priv;
klass = GST_ELEMENT_GET_CLASS (element);
GST_DEBUG_OBJECT (element, "requesting pad %s", GST_STR_NULL (name));
/* figure out the template */
if (templ == gst_element_class_get_pad_template (klass, "sink_rtcp")) {
if (priv->rtcpsinkpad != NULL)
goto exists;
result = create_rtcp_sink (jitterbuffer);
} else
goto wrong_template;
return result;
/* ERRORS */
wrong_template:
{
g_warning ("rtpjitterbuffer: this is not our template");
return NULL;
}
exists:
{
g_warning ("rtpjitterbuffer: pad already requested");
return NULL;
}
}
static void
gst_rtp_jitter_buffer_release_pad (GstElement * element, GstPad * pad)
{
GstRtpJitterBuffer *jitterbuffer;
GstRtpJitterBufferPrivate *priv;
g_return_if_fail (GST_IS_RTP_JITTER_BUFFER (element));
g_return_if_fail (GST_IS_PAD (pad));
jitterbuffer = GST_RTP_JITTER_BUFFER (element);
priv = jitterbuffer->priv;
GST_DEBUG_OBJECT (element, "releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
if (priv->rtcpsinkpad == pad) {
remove_rtcp_sink (jitterbuffer);
} else
goto wrong_pad;
return;
/* ERRORS */
wrong_pad:
{
g_warning ("gstjitterbuffer: asked to release an unknown pad");
return;
}
}
static GstClock *
gst_rtp_jitter_buffer_provide_clock (GstElement * element)
{
return gst_system_clock_obtain ();
}
static void
gst_rtp_jitter_buffer_clear_pt_map (GstRtpJitterBuffer * jitterbuffer)
{
GstRtpJitterBufferPrivate *priv;
priv = jitterbuffer->priv;
/* this will trigger a new pt-map request signal, FIXME, do something better. */
JBUF_LOCK (priv);
priv->clock_rate = -1;
/* do not clear current content, but refresh state for new arrival */
GST_DEBUG_OBJECT (jitterbuffer, "reset jitterbuffer");
rtp_jitter_buffer_reset_skew (priv->jbuf);
priv->last_popped_seqnum = -1;
priv->next_seqnum = -1;
JBUF_UNLOCK (priv);
}
static GstClockTime
gst_rtp_jitter_buffer_set_active (GstRtpJitterBuffer * jbuf, gboolean active,
guint64 offset)
{
GstRtpJitterBufferPrivate *priv;
GstClockTime last_out;
RTPJitterBufferItem *item;
priv = jbuf->priv;
JBUF_LOCK (priv);
GST_DEBUG_OBJECT (jbuf, "setting active %d with offset %" GST_TIME_FORMAT,
active, GST_TIME_ARGS (offset));
if (active != priv->active) {
/* add the amount of time spent in paused to the output offset. All
* outgoing buffers will have this offset applied to their timestamps in
* order to make them arrive in time in the sink. */
priv->out_offset = offset;
GST_DEBUG_OBJECT (jbuf, "out offset %" GST_TIME_FORMAT,
GST_TIME_ARGS (priv->out_offset));
priv->active = active;
JBUF_SIGNAL_EVENT (priv);
}
if (!active) {
rtp_jitter_buffer_set_buffering (priv->jbuf, TRUE);
}
if ((item = rtp_jitter_buffer_peek (priv->jbuf))) {
/* head buffer timestamp and offset gives our output time */
last_out = item->dts + priv->ts_offset;
} else {
/* use last known time when the buffer is empty */
last_out = priv->last_out_time;
}
JBUF_UNLOCK (priv);
return last_out;
}
static GstCaps *
gst_rtp_jitter_buffer_getcaps (GstPad * pad, GstCaps * filter)
{
GstRtpJitterBuffer *jitterbuffer;
GstRtpJitterBufferPrivate *priv;
GstPad *other;
GstCaps *caps;
GstCaps *templ;
jitterbuffer = GST_RTP_JITTER_BUFFER (gst_pad_get_parent (pad));
priv = jitterbuffer->priv;
other = (pad == priv->srcpad ? priv->sinkpad : priv->srcpad);
caps = gst_pad_peer_query_caps (other, filter);
templ = gst_pad_get_pad_template_caps (pad);
if (caps == NULL) {
GST_DEBUG_OBJECT (jitterbuffer, "use template");
caps = templ;
} else {
GstCaps *intersect;
GST_DEBUG_OBJECT (jitterbuffer, "intersect with template");
intersect = gst_caps_intersect (caps, templ);
gst_caps_unref (caps);
gst_caps_unref (templ);
caps = intersect;
}
gst_object_unref (jitterbuffer);
return caps;
}
/*
* Must be called with JBUF_LOCK held
*/
static gboolean
gst_jitter_buffer_sink_parse_caps (GstRtpJitterBuffer * jitterbuffer,
GstCaps * caps)
{
GstRtpJitterBufferPrivate *priv;
GstStructure *caps_struct;
guint val;
GstClockTime tval;
priv = jitterbuffer->priv;
/* first parse the caps */
caps_struct = gst_caps_get_structure (caps, 0);
GST_DEBUG_OBJECT (jitterbuffer, "got caps");
/* we need a clock-rate to convert the rtp timestamps to GStreamer time and to
* measure the amount of data in the buffer */
if (!gst_structure_get_int (caps_struct, "clock-rate", &priv->clock_rate))
goto error;
if (priv->clock_rate <= 0)
goto wrong_rate;
GST_DEBUG_OBJECT (jitterbuffer, "got clock-rate %d", priv->clock_rate);
rtp_jitter_buffer_set_clock_rate (priv->jbuf, priv->clock_rate);
/* The clock base is the RTP timestamp corrsponding to the npt-start value. We
* can use this to track the amount of time elapsed on the sender. */
if (gst_structure_get_uint (caps_struct, "clock-base", &val))
priv->clock_base = val;
else
priv->clock_base = -1;
priv->ext_timestamp = priv->clock_base;
GST_DEBUG_OBJECT (jitterbuffer, "got clock-base %" G_GINT64_FORMAT,
priv->clock_base);
if (gst_structure_get_uint (caps_struct, "seqnum-base", &val)) {
/* first expected seqnum, only update when we didn't have a previous base. */
if (priv->next_in_seqnum == -1)
priv->next_in_seqnum = val;
if (priv->next_seqnum == -1)
priv->next_seqnum = val;
}
GST_DEBUG_OBJECT (jitterbuffer, "got seqnum-base %d", priv->next_in_seqnum);
/* the start and stop times. The seqnum-base corresponds to the start time. We
* will keep track of the seqnums on the output and when we reach the one
* corresponding to npt-stop, we emit the npt-stop-reached signal */
if (gst_structure_get_clock_time (caps_struct, "npt-start", &tval))
priv->npt_start = tval;
else
priv->npt_start = 0;
if (gst_structure_get_clock_time (caps_struct, "npt-stop", &tval))
priv->npt_stop = tval;
else
priv->npt_stop = -1;
GST_DEBUG_OBJECT (jitterbuffer,
"npt start/stop: %" GST_TIME_FORMAT "-%" GST_TIME_FORMAT,
GST_TIME_ARGS (priv->npt_start), GST_TIME_ARGS (priv->npt_stop));
return TRUE;
/* ERRORS */
error:
{
GST_DEBUG_OBJECT (jitterbuffer, "No clock-rate in caps!");
return FALSE;
}
wrong_rate:
{
GST_DEBUG_OBJECT (jitterbuffer, "Invalid clock-rate %d", priv->clock_rate);
return FALSE;
}
}
static void
gst_rtp_jitter_buffer_flush_start (GstRtpJitterBuffer * jitterbuffer)
{
GstRtpJitterBufferPrivate *priv;
priv = jitterbuffer->priv;
JBUF_LOCK (priv);
/* mark ourselves as flushing */
priv->srcresult = GST_FLOW_FLUSHING;
GST_DEBUG_OBJECT (jitterbuffer, "Disabling pop on queue");
/* this unblocks any waiting pops on the src pad task */
JBUF_SIGNAL_EVENT (priv);
JBUF_UNLOCK (priv);
}
static void
gst_rtp_jitter_buffer_flush_stop (GstRtpJitterBuffer * jitterbuffer)
{
GstRtpJitterBufferPrivate *priv;
priv = jitterbuffer->priv;
JBUF_LOCK (priv);
GST_DEBUG_OBJECT (jitterbuffer, "Enabling pop on queue");
/* Mark as non flushing */
priv->srcresult = GST_FLOW_OK;
gst_segment_init (&priv->segment, GST_FORMAT_TIME);
priv->last_popped_seqnum = -1;
priv->last_out_time = -1;
priv->next_seqnum = -1;
priv->ips_rtptime = -1;
priv->ips_dts = GST_CLOCK_TIME_NONE;
priv->packet_spacing = 0;
priv->next_in_seqnum = -1;
priv->clock_rate = -1;
priv->eos = FALSE;
priv->estimated_eos = -1;
priv->last_elapsed = 0;
priv->ext_timestamp = -1;
GST_DEBUG_OBJECT (jitterbuffer, "flush and reset jitterbuffer");
rtp_jitter_buffer_flush (priv->jbuf, (GFunc) free_item, NULL);
rtp_jitter_buffer_reset_skew (priv->jbuf);
remove_all_timers (jitterbuffer);
JBUF_UNLOCK (priv);
}
static gboolean
gst_rtp_jitter_buffer_src_activate_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active)
{
gboolean result;
GstRtpJitterBuffer *jitterbuffer = NULL;
jitterbuffer = GST_RTP_JITTER_BUFFER (parent);
switch (mode) {
case GST_PAD_MODE_PUSH:
if (active) {
/* allow data processing */
gst_rtp_jitter_buffer_flush_stop (jitterbuffer);
/* start pushing out buffers */
GST_DEBUG_OBJECT (jitterbuffer, "Starting task on srcpad");
result = gst_pad_start_task (jitterbuffer->priv->srcpad,
(GstTaskFunction) gst_rtp_jitter_buffer_loop, jitterbuffer, NULL);
} else {
/* make sure all data processing stops ASAP */
gst_rtp_jitter_buffer_flush_start (jitterbuffer);
/* NOTE this will hardlock if the state change is called from the src pad
* task thread because we will _join() the thread. */
GST_DEBUG_OBJECT (jitterbuffer, "Stopping task on srcpad");
result = gst_pad_stop_task (pad);
}
break;
default:
result = FALSE;
break;
}
return result;
}
static GstStateChangeReturn
gst_rtp_jitter_buffer_change_state (GstElement * element,
GstStateChange transition)
{
GstRtpJitterBuffer *jitterbuffer;
GstRtpJitterBufferPrivate *priv;
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
jitterbuffer = GST_RTP_JITTER_BUFFER (element);
priv = jitterbuffer->priv;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
JBUF_LOCK (priv);
/* reset negotiated values */
priv->clock_rate = -1;
priv->clock_base = -1;
priv->peer_latency = 0;
priv->last_pt = -1;
/* block until we go to PLAYING */
priv->blocked = TRUE;
priv->timer_running = TRUE;
priv->timer_thread =
g_thread_new ("timer", (GThreadFunc) wait_next_timeout, jitterbuffer);
JBUF_UNLOCK (priv);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
JBUF_LOCK (priv);
/* unblock to allow streaming in PLAYING */
priv->blocked = FALSE;
JBUF_SIGNAL_EVENT (priv);
JBUF_SIGNAL_TIMER (priv);
JBUF_UNLOCK (priv);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
/* we are a live element because we sync to the clock, which we can only
* do in the PLAYING state */
if (ret != GST_STATE_CHANGE_FAILURE)
ret = GST_STATE_CHANGE_NO_PREROLL;
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
JBUF_LOCK (priv);
/* block to stop streaming when PAUSED */
priv->blocked = TRUE;
unschedule_current_timer (jitterbuffer);
JBUF_UNLOCK (priv);
if (ret != GST_STATE_CHANGE_FAILURE)
ret = GST_STATE_CHANGE_NO_PREROLL;
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
JBUF_LOCK (priv);
gst_buffer_replace (&priv->last_sr, NULL);
priv->timer_running = FALSE;
unschedule_current_timer (jitterbuffer);
JBUF_SIGNAL_TIMER (priv);
JBUF_UNLOCK (priv);
g_thread_join (priv->timer_thread);
priv->timer_thread = NULL;
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
static gboolean
gst_rtp_jitter_buffer_src_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
gboolean ret = TRUE;
GstRtpJitterBuffer *jitterbuffer;
GstRtpJitterBufferPrivate *priv;
jitterbuffer = GST_RTP_JITTER_BUFFER (parent);
priv = jitterbuffer->priv;
GST_DEBUG_OBJECT (jitterbuffer, "received %s", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_LATENCY:
{
GstClockTime latency;
gst_event_parse_latency (event, &latency);
GST_DEBUG_OBJECT (jitterbuffer,
"configuring latency of %" GST_TIME_FORMAT, GST_TIME_ARGS (latency));
JBUF_LOCK (priv);
/* adjust the overall buffer delay to the total pipeline latency in
* buffering mode because if downstream consumes too fast (because of
* large latency or queues, we would start rebuffering again. */
if (rtp_jitter_buffer_get_mode (priv->jbuf) ==
RTP_JITTER_BUFFER_MODE_BUFFER) {
rtp_jitter_buffer_set_delay (priv->jbuf, latency);
}
JBUF_UNLOCK (priv);
ret = gst_pad_push_event (priv->sinkpad, event);
break;
}
default:
ret = gst_pad_push_event (priv->sinkpad, event);
break;
}
return ret;
}
static gboolean
gst_rtp_jitter_buffer_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
gboolean ret = TRUE;
GstRtpJitterBuffer *jitterbuffer;
GstRtpJitterBufferPrivate *priv;
jitterbuffer = GST_RTP_JITTER_BUFFER (parent);
priv = jitterbuffer->priv;
GST_DEBUG_OBJECT (jitterbuffer, "received %s", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
JBUF_LOCK (priv);
ret = gst_jitter_buffer_sink_parse_caps (jitterbuffer, caps);
JBUF_UNLOCK (priv);
/* set same caps on srcpad on success */
if (ret)
ret = gst_pad_push_event (priv->srcpad, event);
else
gst_event_unref (event);
break;
}
case GST_EVENT_SEGMENT:
{
gst_event_copy_segment (event, &priv->segment);
/* we need time for now */
if (priv->segment.format != GST_FORMAT_TIME)
goto newseg_wrong_format;
GST_DEBUG_OBJECT (jitterbuffer,
"newsegment: %" GST_SEGMENT_FORMAT, &priv->segment);
/* FIXME, push SEGMENT in the queue. Sorting order might be difficult. */
ret = gst_pad_push_event (priv->srcpad, event);
break;
}
case GST_EVENT_FLUSH_START:
ret = gst_pad_push_event (priv->srcpad, event);
gst_rtp_jitter_buffer_flush_start (jitterbuffer);
break;
case GST_EVENT_FLUSH_STOP:
ret = gst_pad_push_event (priv->srcpad, event);
ret =
gst_rtp_jitter_buffer_src_activate_mode (priv->srcpad, parent,
GST_PAD_MODE_PUSH, TRUE);
break;
case GST_EVENT_EOS:
{
/* push EOS in queue. We always push it at the head */
JBUF_LOCK (priv);
/* check for flushing, we need to discard the event and return FALSE when
* we are flushing */
ret = priv->srcresult == GST_FLOW_OK;
if (ret && !priv->eos) {
GST_INFO_OBJECT (jitterbuffer, "queuing EOS");
priv->eos = TRUE;
JBUF_SIGNAL_EVENT (priv);
} else if (priv->eos) {
GST_DEBUG_OBJECT (jitterbuffer, "dropping EOS, we are already EOS");
} else {
GST_DEBUG_OBJECT (jitterbuffer, "dropping EOS, reason %s",
gst_flow_get_name (priv->srcresult));
}
JBUF_UNLOCK (priv);
gst_event_unref (event);
break;
}
default:
ret = gst_pad_push_event (priv->srcpad, event);
break;
}
done:
return ret;
/* ERRORS */
newseg_wrong_format:
{
GST_DEBUG_OBJECT (jitterbuffer, "received non TIME newsegment");
ret = FALSE;
gst_event_unref (event);
goto done;
}
}
static gboolean
gst_rtp_jitter_buffer_sink_rtcp_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
gboolean ret = TRUE;
GstRtpJitterBuffer *jitterbuffer;
jitterbuffer = GST_RTP_JITTER_BUFFER (parent);
GST_DEBUG_OBJECT (jitterbuffer, "received %s", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
gst_event_unref (event);
break;
case GST_EVENT_FLUSH_STOP:
gst_event_unref (event);
break;
default:
ret = gst_pad_event_default (pad, parent, event);
break;
}
return ret;
}
/*
* Must be called with JBUF_LOCK held, will release the LOCK when emiting the
* signal. The function returns GST_FLOW_ERROR when a parsing error happened and
* GST_FLOW_FLUSHING when the element is shutting down. On success
* GST_FLOW_OK is returned.
*/
static GstFlowReturn
gst_rtp_jitter_buffer_get_clock_rate (GstRtpJitterBuffer * jitterbuffer,
guint8 pt)
{
GValue ret = { 0 };
GValue args[2] = { {0}, {0} };
GstCaps *caps;
gboolean res;
g_value_init (&args[0], GST_TYPE_ELEMENT);
g_value_set_object (&args[0], jitterbuffer);
g_value_init (&args[1], G_TYPE_UINT);
g_value_set_uint (&args[1], pt);
g_value_init (&ret, GST_TYPE_CAPS);
g_value_set_boxed (&ret, NULL);
JBUF_UNLOCK (jitterbuffer->priv);
g_signal_emitv (args, gst_rtp_jitter_buffer_signals[SIGNAL_REQUEST_PT_MAP], 0,
&ret);
JBUF_LOCK_CHECK (jitterbuffer->priv, out_flushing);
g_value_unset (&args[0]);
g_value_unset (&args[1]);
caps = (GstCaps *) g_value_dup_boxed (&ret);
g_value_unset (&ret);
if (!caps)
goto no_caps;
res = gst_jitter_buffer_sink_parse_caps (jitterbuffer, caps);
gst_caps_unref (caps);
if (G_UNLIKELY (!res))
goto parse_failed;
return GST_FLOW_OK;
/* ERRORS */
no_caps:
{
GST_DEBUG_OBJECT (jitterbuffer, "could not get caps");
return GST_FLOW_ERROR;
}
out_flushing:
{
GST_DEBUG_OBJECT (jitterbuffer, "we are flushing");
return GST_FLOW_FLUSHING;
}
parse_failed:
{
GST_DEBUG_OBJECT (jitterbuffer, "parse failed");
return GST_FLOW_ERROR;
}
}
/* call with jbuf lock held */
static void
check_buffering_percent (GstRtpJitterBuffer * jitterbuffer, gint * percent)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
/* too short a stream, or too close to EOS will never really fill buffer */
if (*percent != -1 && priv->npt_stop != -1 &&
priv->npt_stop - priv->npt_start <=
rtp_jitter_buffer_get_delay (priv->jbuf)) {
GST_DEBUG_OBJECT (jitterbuffer, "short stream; faking full buffer");
rtp_jitter_buffer_set_buffering (priv->jbuf, FALSE);
*percent = 100;
}
}
static void
post_buffering_percent (GstRtpJitterBuffer * jitterbuffer, gint percent)
{
GstMessage *message;
/* Post a buffering message */
message = gst_message_new_buffering (GST_OBJECT_CAST (jitterbuffer), percent);
gst_message_set_buffering_stats (message, GST_BUFFERING_LIVE, -1, -1, -1);
gst_element_post_message (GST_ELEMENT_CAST (jitterbuffer), message);
}
static GstClockTime
apply_offset (GstRtpJitterBuffer * jitterbuffer, GstClockTime timestamp)
{
GstRtpJitterBufferPrivate *priv;
priv = jitterbuffer->priv;
if (timestamp == -1)
return -1;
/* apply the timestamp offset, this is used for inter stream sync */
timestamp += priv->ts_offset;
/* add the offset, this is used when buffering */
timestamp += priv->out_offset;
return timestamp;
}
static TimerData *
find_timer (GstRtpJitterBuffer * jitterbuffer, TimerType type, guint16 seqnum)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
TimerData *timer = NULL;
gint i, len;
len = priv->timers->len;
for (i = 0; i < len; i++) {
TimerData *test = &g_array_index (priv->timers, TimerData, i);
if (test->seqnum == seqnum && test->type == type) {
timer = test;
break;
}
}
return timer;
}
static void
unschedule_current_timer (GstRtpJitterBuffer * jitterbuffer)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
if (priv->clock_id) {
GST_DEBUG_OBJECT (jitterbuffer, "unschedule current timer");
gst_clock_id_unschedule (priv->clock_id);
priv->clock_id = NULL;
}
}
static GstClockTime
get_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
GstClockTime test_timeout;
if ((test_timeout = timer->timeout) == -1)
return -1;
if (timer->type != TIMER_TYPE_EXPECTED) {
/* add our latency and offset to get output times. */
test_timeout = apply_offset (jitterbuffer, test_timeout);
test_timeout += priv->latency_ns;
}
return test_timeout;
}
static void
recalculate_timer (GstRtpJitterBuffer * jitterbuffer, TimerData * timer)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
if (priv->clock_id) {
GstClockTime timeout = get_timeout (jitterbuffer, timer);
GST_DEBUG ("%" GST_TIME_FORMAT " <> %" GST_TIME_FORMAT,
GST_TIME_ARGS (timeout), GST_TIME_ARGS (priv->timer_timeout));
if (timeout == -1 || timeout < priv->timer_timeout)
unschedule_current_timer (jitterbuffer);
}
}
static TimerData *
add_timer (GstRtpJitterBuffer * jitterbuffer, TimerType type,
guint16 seqnum, guint num, GstClockTime timeout, GstClockTime delay,
GstClockTime duration)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
TimerData *timer;
gint len;
GST_DEBUG_OBJECT (jitterbuffer,
"add timer for seqnum %d to %" GST_TIME_FORMAT ", delay %"
GST_TIME_FORMAT, seqnum, GST_TIME_ARGS (timeout), GST_TIME_ARGS (delay));
len = priv->timers->len;
g_array_set_size (priv->timers, len + 1);
timer = &g_array_index (priv->timers, TimerData, len);
timer->idx = len;
timer->type = type;
timer->seqnum = seqnum;
timer->num = num;
timer->timeout = timeout + delay;
timer->duration = duration;
if (type == TIMER_TYPE_EXPECTED) {
timer->rtx_base = timeout;
timer->rtx_delay = delay;
timer->rtx_retry = 0;
}
timer->num_rtx_retry = 0;
recalculate_timer (jitterbuffer, timer);
JBUF_SIGNAL_TIMER (priv);
return timer;
}
static void
reschedule_timer (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
guint16 seqnum, GstClockTime timeout, GstClockTime delay, gboolean reset)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
gboolean seqchange, timechange;
guint16 oldseq;
seqchange = timer->seqnum != seqnum;
timechange = timer->timeout != timeout;
if (!seqchange && !timechange)
return;
oldseq = timer->seqnum;
GST_DEBUG_OBJECT (jitterbuffer,
"replace timer for seqnum %d->%d to %" GST_TIME_FORMAT,
oldseq, seqnum, GST_TIME_ARGS (timeout + delay));
timer->timeout = timeout + delay;
timer->seqnum = seqnum;
if (reset) {
timer->rtx_base = timeout;
timer->rtx_delay = delay;
timer->rtx_retry = 0;
}
if (priv->clock_id) {
/* we changed the seqnum and there is a timer currently waiting with this
* seqnum, unschedule it */
if (seqchange && priv->timer_seqnum == oldseq)
unschedule_current_timer (jitterbuffer);
/* we changed the time, check if it is earlier than what we are waiting
* for and unschedule if so */
else if (timechange)
recalculate_timer (jitterbuffer, timer);
}
}
static TimerData *
set_timer (GstRtpJitterBuffer * jitterbuffer, TimerType type,
guint16 seqnum, GstClockTime timeout)
{
TimerData *timer;
/* find the seqnum timer */
timer = find_timer (jitterbuffer, type, seqnum);
if (timer == NULL) {
timer = add_timer (jitterbuffer, type, seqnum, 0, timeout, 0, -1);
} else {
reschedule_timer (jitterbuffer, timer, seqnum, timeout, 0, FALSE);
}
return timer;
}
static void
remove_timer (GstRtpJitterBuffer * jitterbuffer, TimerData * timer)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
guint idx;
if (priv->clock_id && priv->timer_seqnum == timer->seqnum)
unschedule_current_timer (jitterbuffer);
idx = timer->idx;
GST_DEBUG_OBJECT (jitterbuffer, "removed index %d", idx);
g_array_remove_index_fast (priv->timers, idx);
timer->idx = idx;
}
static void
remove_all_timers (GstRtpJitterBuffer * jitterbuffer)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
GST_DEBUG_OBJECT (jitterbuffer, "removed all timers");
g_array_set_size (priv->timers, 0);
unschedule_current_timer (jitterbuffer);
}
/* we just received a packet with seqnum and dts.
*
* First check for old seqnum that we are still expecting. If the gap with the
* current seqnum is too big, unschedule the timeouts.
*
* If we have a valid packet spacing estimate we can set a timer for when we
* should receive the next packet.
* If we don't have a valid estimate, we remove any timer we might have
* had for this packet.
*/
static void
update_timers (GstRtpJitterBuffer * jitterbuffer, guint16 seqnum,
GstClockTime dts, gboolean do_next_seqnum)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
TimerData *timer = NULL;
gint i, len;
/* go through all timers and unschedule the ones with a large gap, also find
* the timer for the seqnum */
len = priv->timers->len;
for (i = 0; i < len; i++) {
TimerData *test = &g_array_index (priv->timers, TimerData, i);
gint gap;
gap = gst_rtp_buffer_compare_seqnum (test->seqnum, seqnum);
GST_DEBUG_OBJECT (jitterbuffer, "%d, #%d<->#%d gap %d", i,
test->seqnum, seqnum, gap);
if (gap == 0) {
GST_DEBUG ("found timer for current seqnum");
/* the timer for the current seqnum */
timer = test;
} else if (gap > priv->rtx_delay_reorder) {
/* max gap, we exceeded the max reorder distance and we don't expect the
* missing packet to be this reordered */
if (test->num_rtx_retry == 0 && test->type == TIMER_TYPE_EXPECTED)
reschedule_timer (jitterbuffer, test, test->seqnum, -1, 0, FALSE);
}
}
if (priv->packet_spacing > 0 && do_next_seqnum && priv->do_retransmission) {
GstClockTime expected, delay;
/* calculate expected arrival time of the next seqnum */
expected = dts + priv->packet_spacing;
delay = priv->rtx_delay * GST_MSECOND;
/* and update/install timer for next seqnum */
if (timer)
reschedule_timer (jitterbuffer, timer, priv->next_in_seqnum, expected,
delay, TRUE);
else
add_timer (jitterbuffer, TIMER_TYPE_EXPECTED, priv->next_in_seqnum, 0,
expected, delay, priv->packet_spacing);
} else if (timer && timer->type != TIMER_TYPE_DEADLINE) {
if (timer->num_rtx_retry > 0) {
GstClockTime rtx_last;
/* we scheduled a retry for this packet and now we have it */
priv->num_rtx_success++;
/* all the previous retry attempts failed */
priv->num_rtx_failed += timer->num_rtx_retry - 1;
/* number of retries before receiving the packet */
if (priv->avg_rtx_num == 0.0)
priv->avg_rtx_num = timer->num_rtx_retry;
else
priv->avg_rtx_num = (timer->num_rtx_retry + 7 * priv->avg_rtx_num) / 8;
/* calculate the delay between retransmission request and receiving this
* packet, start with when we scheduled this timeout last */
rtx_last = timer->rtx_last;
if (dts > rtx_last) {
GstClockTime delay;
/* we have a valid delay if this packet arrived after we scheduled the
* request */
delay = dts - rtx_last;
if (priv->avg_rtx_rtt == 0)
priv->avg_rtx_rtt = delay;
else
priv->avg_rtx_rtt = (delay + 7 * priv->avg_rtx_rtt) / 8;
}
GST_LOG_OBJECT (jitterbuffer,
"RTX success %" G_GUINT64_FORMAT ", failed %" G_GUINT64_FORMAT
", requests %" G_GUINT64_FORMAT ", dups %" G_GUINT64_FORMAT
", avg-num %g, avg-rtt %" G_GUINT64_FORMAT, priv->num_rtx_success,
priv->num_rtx_failed, priv->num_rtx_requests, priv->num_duplicates,
priv->avg_rtx_num, priv->avg_rtx_rtt);
}
/* if we had a timer, remove it, we don't know when to expect the next
* packet. */
remove_timer (jitterbuffer, timer);
/* we signal the _loop function because this new packet could be the one
* it was waiting for */
JBUF_SIGNAL_EVENT (priv);
}
}
static void
calculate_packet_spacing (GstRtpJitterBuffer * jitterbuffer, guint32 rtptime,
GstClockTime dts)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
/* we need consecutive seqnums with a different
* rtptime to estimate the packet spacing. */
if (priv->ips_rtptime != rtptime) {
/* rtptime changed, check dts diff */
if (priv->ips_dts != -1 && dts != -1 && dts > priv->ips_dts) {
priv->packet_spacing = dts - priv->ips_dts;
GST_DEBUG_OBJECT (jitterbuffer,
"new packet spacing %" GST_TIME_FORMAT,
GST_TIME_ARGS (priv->packet_spacing));
}
priv->ips_rtptime = rtptime;
priv->ips_dts = dts;
}
}
static void
calculate_expected (GstRtpJitterBuffer * jitterbuffer, guint32 expected,
guint16 seqnum, GstClockTime dts, gint gap)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
GstClockTime total_duration, duration, expected_dts;
TimerType type;
GST_DEBUG_OBJECT (jitterbuffer,
"dts %" GST_TIME_FORMAT ", last %" GST_TIME_FORMAT,
GST_TIME_ARGS (dts), GST_TIME_ARGS (priv->last_in_dts));
/* the total duration spanned by the missing packets */
if (dts >= priv->last_in_dts)
total_duration = dts - priv->last_in_dts;
else
total_duration = 0;
/* interpolate between the current time and the last time based on
* number of packets we are missing, this is the estimated duration
* for the missing packet based on equidistant packet spacing. */
duration = total_duration / (gap + 1);
GST_DEBUG_OBJECT (jitterbuffer, "duration %" GST_TIME_FORMAT,
GST_TIME_ARGS (duration));
if (total_duration > priv->latency_ns) {
GstClockTime gap_time;
guint lost_packets;
gap_time = total_duration - priv->latency_ns;
if (duration > 0) {
lost_packets = gap_time / duration;
gap_time = lost_packets * duration;
} else {
lost_packets = gap;
}
/* too many lost packets, some of the missing packets are already
* too late and we can generate lost packet events for them. */
GST_DEBUG_OBJECT (jitterbuffer, "too many lost packets %" GST_TIME_FORMAT
" > %" GST_TIME_FORMAT ", consider %u lost",
GST_TIME_ARGS (total_duration), GST_TIME_ARGS (priv->latency_ns),
lost_packets);
/* this timer will fire immediately and the lost event will be pushed from
* the timer thread */
add_timer (jitterbuffer, TIMER_TYPE_LOST, expected, lost_packets,
priv->last_in_dts + duration, 0, gap_time);
expected += lost_packets;
priv->last_in_dts += gap_time;
}
expected_dts = priv->last_in_dts + duration;
if (priv->do_retransmission) {
TimerData *timer;
type = TIMER_TYPE_EXPECTED;
/* if we had a timer for the first missing packet, update it. */
if ((timer = find_timer (jitterbuffer, type, expected))) {
GstClockTime timeout = timer->timeout;
timer->duration = duration;
if (timeout > expected_dts) {
GstClockTime delay = timeout - expected_dts - timer->rtx_retry;
reschedule_timer (jitterbuffer, timer, timer->seqnum, expected_dts,
delay, TRUE);
}
expected++;
expected_dts += duration;
}
} else {
type = TIMER_TYPE_LOST;
}
while (expected < seqnum) {
add_timer (jitterbuffer, type, expected, 0, expected_dts, 0, duration);
expected_dts += duration;
expected++;
}
}
static GstFlowReturn
gst_rtp_jitter_buffer_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstRtpJitterBuffer *jitterbuffer;
GstRtpJitterBufferPrivate *priv;
guint16 seqnum;
guint32 expected, rtptime;
GstFlowReturn ret = GST_FLOW_OK;
GstClockTime dts, pts;
guint64 latency_ts;
gboolean tail;
gint percent = -1;
guint8 pt;
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
gboolean do_next_seqnum = FALSE;
RTPJitterBufferItem *item;
jitterbuffer = GST_RTP_JITTER_BUFFER (parent);
priv = jitterbuffer->priv;
if (G_UNLIKELY (!gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp)))
goto invalid_buffer;
pt = gst_rtp_buffer_get_payload_type (&rtp);
seqnum = gst_rtp_buffer_get_seq (&rtp);
rtptime = gst_rtp_buffer_get_timestamp (&rtp);
gst_rtp_buffer_unmap (&rtp);
/* make sure we have PTS and DTS set */
pts = GST_BUFFER_PTS (buffer);
dts = GST_BUFFER_DTS (buffer);
if (dts == -1)
dts = pts;
else if (pts == -1)
pts = dts;
/* take the DTS of the buffer. This is the time when the packet was
* received and is used to calculate jitter and clock skew. We will adjust
* this DTS with the smoothed value after processing it in the
* jitterbuffer and assign it as the PTS. */
/* bring to running time */
dts = gst_segment_to_running_time (&priv->segment, GST_FORMAT_TIME, dts);
GST_DEBUG_OBJECT (jitterbuffer,
"Received packet #%d at time %" GST_TIME_FORMAT ", discont %d", seqnum,
GST_TIME_ARGS (dts), GST_BUFFER_IS_DISCONT (buffer));
JBUF_LOCK_CHECK (priv, out_flushing);
if (G_UNLIKELY (priv->last_pt != pt)) {
GstCaps *caps;
GST_DEBUG_OBJECT (jitterbuffer, "pt changed from %u to %u", priv->last_pt,
pt);
priv->last_pt = pt;
/* reset clock-rate so that we get a new one */
priv->clock_rate = -1;
/* Try to get the clock-rate from the caps first if we can. If there are no
* caps we must fire the signal to get the clock-rate. */
if ((caps = gst_pad_get_current_caps (pad))) {
gst_jitter_buffer_sink_parse_caps (jitterbuffer, caps);
gst_caps_unref (caps);
}
}
if (G_UNLIKELY (priv->clock_rate == -1)) {
/* no clock rate given on the caps, try to get one with the signal */
if (gst_rtp_jitter_buffer_get_clock_rate (jitterbuffer,
pt) == GST_FLOW_FLUSHING)
goto out_flushing;
if (G_UNLIKELY (priv->clock_rate == -1))
goto no_clock_rate;
}
/* don't accept more data on EOS */
if (G_UNLIKELY (priv->eos))
goto have_eos;
expected = priv->next_in_seqnum;
/* now check against our expected seqnum */
if (G_LIKELY (expected != -1)) {
gint gap;
/* now calculate gap */
gap = gst_rtp_buffer_compare_seqnum (expected, seqnum);
GST_DEBUG_OBJECT (jitterbuffer, "expected #%d, got #%d, gap of %d",
expected, seqnum, gap);
if (G_LIKELY (gap == 0)) {
/* packet is expected */
calculate_packet_spacing (jitterbuffer, rtptime, dts);
do_next_seqnum = TRUE;
} else {
gboolean reset = FALSE;
if (gap < 0) {
/* we received an old packet */
if (G_UNLIKELY (gap < -RTP_MAX_MISORDER)) {
/* too old packet, reset */
GST_DEBUG_OBJECT (jitterbuffer, "reset: buffer too old %d < %d", gap,
-RTP_MAX_MISORDER);
reset = TRUE;
} else {
GST_DEBUG_OBJECT (jitterbuffer, "old packet received");
}
} else {
/* new packet, we are missing some packets */
if (G_UNLIKELY (gap > RTP_MAX_DROPOUT)) {
/* packet too far in future, reset */
GST_DEBUG_OBJECT (jitterbuffer, "reset: buffer too new %d > %d", gap,
RTP_MAX_DROPOUT);
reset = TRUE;
} else {
GST_DEBUG_OBJECT (jitterbuffer, "%d missing packets", gap);
/* fill in the gap with EXPECTED timers */
calculate_expected (jitterbuffer, expected, seqnum, dts, gap);
do_next_seqnum = TRUE;
}
}
if (G_UNLIKELY (reset)) {
GST_DEBUG_OBJECT (jitterbuffer, "flush and reset jitterbuffer");
rtp_jitter_buffer_flush (priv->jbuf, (GFunc) free_item, NULL);
rtp_jitter_buffer_reset_skew (priv->jbuf);
remove_all_timers (jitterbuffer);
priv->last_popped_seqnum = -1;
priv->next_seqnum = seqnum;
do_next_seqnum = TRUE;
}
/* reset spacing estimation when gap */
priv->ips_rtptime = -1;
priv->ips_dts = GST_CLOCK_TIME_NONE;
}
} else {
GST_DEBUG_OBJECT (jitterbuffer, "First buffer #%d", seqnum);
/* we don't know what the next_in_seqnum should be, wait for the last
* possible moment to push this buffer, maybe we get an earlier seqnum
* while we wait */
set_timer (jitterbuffer, TIMER_TYPE_DEADLINE, seqnum, dts);
do_next_seqnum = TRUE;
/* take rtptime and dts to calculate packet spacing */
priv->ips_rtptime = rtptime;
priv->ips_dts = dts;
}
if (do_next_seqnum) {
priv->last_in_seqnum = seqnum;
priv->last_in_dts = dts;
priv->next_in_seqnum = (seqnum + 1) & 0xffff;
}
/* let's check if this buffer is too late, we can only accept packets with
* bigger seqnum than the one we last pushed. */
if (G_LIKELY (priv->last_popped_seqnum != -1)) {
gint gap;
gap = gst_rtp_buffer_compare_seqnum (priv->last_popped_seqnum, seqnum);
/* priv->last_popped_seqnum >= seqnum, we're too late. */
if (G_UNLIKELY (gap <= 0))
goto too_late;
}
/* let's drop oldest packet if the queue is already full and drop-on-latency
* is set. We can only do this when there actually is a latency. When no
* latency is set, we just pump it in the queue and let the other end push it
* out as fast as possible. */
if (priv->latency_ms && priv->drop_on_latency) {
latency_ts =
gst_util_uint64_scale_int (priv->latency_ms, priv->clock_rate, 1000);
if (G_UNLIKELY (rtp_jitter_buffer_get_ts_diff (priv->jbuf) >= latency_ts)) {
RTPJitterBufferItem *old_item;
old_item = rtp_jitter_buffer_pop (priv->jbuf, &percent);
GST_DEBUG_OBJECT (jitterbuffer, "Queue full, dropping old packet %p",
old_item);
free_item (old_item);
}
}
item = alloc_item (buffer, ITEM_TYPE_BUFFER, dts, pts, seqnum, 1, rtptime);
/* now insert the packet into the queue in sorted order. This function returns
* FALSE if a packet with the same seqnum was already in the queue, meaning we
* have a duplicate. */
if (G_UNLIKELY (!rtp_jitter_buffer_insert (priv->jbuf, item,
&tail, &percent)))
goto duplicate;
/* update timers */
update_timers (jitterbuffer, seqnum, dts, do_next_seqnum);
/* we had an unhandled SR, handle it now */
if (priv->last_sr)
do_handle_sync (jitterbuffer);
/* signal addition of new buffer when the _loop is waiting. */
if (priv->active && priv->waiting_timer)
JBUF_SIGNAL_EVENT (priv);
/* let's unschedule and unblock any waiting buffers. We only want to do this
* when the tail buffer changed */
if (G_UNLIKELY (priv->clock_id && tail)) {
GST_DEBUG_OBJECT (jitterbuffer, "Unscheduling waiting new buffer");
unschedule_current_timer (jitterbuffer);
}
GST_DEBUG_OBJECT (jitterbuffer, "Pushed packet #%d, now %d packets, tail: %d",
seqnum, rtp_jitter_buffer_num_packets (priv->jbuf), tail);
check_buffering_percent (jitterbuffer, &percent);
finished:
JBUF_UNLOCK (priv);
if (percent != -1)
post_buffering_percent (jitterbuffer, percent);
return ret;
/* ERRORS */
invalid_buffer:
{
/* this is not fatal but should be filtered earlier */
GST_ELEMENT_WARNING (jitterbuffer, STREAM, DECODE, (NULL),
("Received invalid RTP payload, dropping"));
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
no_clock_rate:
{
GST_WARNING_OBJECT (jitterbuffer,
"No clock-rate in caps!, dropping buffer");
gst_buffer_unref (buffer);
goto finished;
}
out_flushing:
{
ret = priv->srcresult;
GST_DEBUG_OBJECT (jitterbuffer, "flushing %s", gst_flow_get_name (ret));
gst_buffer_unref (buffer);
goto finished;
}
have_eos:
{
ret = GST_FLOW_EOS;
GST_WARNING_OBJECT (jitterbuffer, "we are EOS, refusing buffer");
gst_buffer_unref (buffer);
goto finished;
}
too_late:
{
GST_WARNING_OBJECT (jitterbuffer, "Packet #%d too late as #%d was already"
" popped, dropping", seqnum, priv->last_popped_seqnum);
priv->num_late++;
gst_buffer_unref (buffer);
goto finished;
}
duplicate:
{
GST_WARNING_OBJECT (jitterbuffer, "Duplicate packet #%d detected, dropping",
seqnum);
priv->num_duplicates++;
free_item (item);
goto finished;
}
}
static GstClockTime
compute_elapsed (GstRtpJitterBuffer * jitterbuffer, RTPJitterBufferItem * item)
{
guint64 ext_time, elapsed;
guint32 rtp_time;
GstRtpJitterBufferPrivate *priv;
priv = jitterbuffer->priv;
rtp_time = item->rtptime;
GST_LOG_OBJECT (jitterbuffer, "rtp %" G_GUINT32_FORMAT ", ext %"
G_GUINT64_FORMAT, rtp_time, priv->ext_timestamp);
if (rtp_time < priv->ext_timestamp) {
ext_time = priv->ext_timestamp;
} else {
ext_time = gst_rtp_buffer_ext_timestamp (&priv->ext_timestamp, rtp_time);
}
if (ext_time > priv->clock_base)
elapsed = ext_time - priv->clock_base;
else
elapsed = 0;
elapsed = gst_util_uint64_scale_int (elapsed, GST_SECOND, priv->clock_rate);
return elapsed;
}
static void
update_estimated_eos (GstRtpJitterBuffer * jitterbuffer,
RTPJitterBufferItem * item)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
if (priv->npt_stop != -1 && priv->ext_timestamp != -1
&& priv->clock_base != -1 && priv->clock_rate > 0) {
guint64 elapsed, estimated;
elapsed = compute_elapsed (jitterbuffer, item);
if (elapsed > priv->last_elapsed || !priv->last_elapsed) {
guint64 left;
GstClockTime out_time;
priv->last_elapsed = elapsed;
left = priv->npt_stop - priv->npt_start;
GST_LOG_OBJECT (jitterbuffer, "left %" GST_TIME_FORMAT,
GST_TIME_ARGS (left));
out_time = item->dts;
if (elapsed > 0)
estimated = gst_util_uint64_scale (out_time, left, elapsed);
else {
/* if there is almost nothing left,
* we may never advance enough to end up in the above case */
if (left < GST_SECOND)
estimated = GST_SECOND;
else
estimated = -1;
}
GST_LOG_OBJECT (jitterbuffer, "elapsed %" GST_TIME_FORMAT ", estimated %"
GST_TIME_FORMAT, GST_TIME_ARGS (elapsed), GST_TIME_ARGS (estimated));
if (estimated != -1 && priv->estimated_eos != estimated) {
set_timer (jitterbuffer, TIMER_TYPE_EOS, -1, estimated);
priv->estimated_eos = estimated;
}
}
}
}
/* take a buffer from the queue and push it */
static GstFlowReturn
pop_and_push_next (GstRtpJitterBuffer * jitterbuffer, guint16 seqnum)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
GstFlowReturn result;
RTPJitterBufferItem *item;
GstBuffer *outbuf;
GstEvent *outevent;
GstClockTime dts, pts;
gint percent = -1;
gboolean is_buffer, do_push = TRUE;
/* when we get here we are ready to pop and push the buffer */
item = rtp_jitter_buffer_pop (priv->jbuf, &percent);
is_buffer = GST_IS_BUFFER (item->data);
if (is_buffer) {
check_buffering_percent (jitterbuffer, &percent);
/* we need to make writable to change the flags and timestamps */
outbuf = gst_buffer_make_writable (item->data);
if (G_UNLIKELY (priv->discont)) {
/* set DISCONT flag when we missed a packet. We pushed the buffer writable
* into the jitterbuffer so we can modify now. */
GST_DEBUG_OBJECT (jitterbuffer, "mark output buffer discont");
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
priv->discont = FALSE;
}
if (G_UNLIKELY (priv->ts_discont)) {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_RESYNC);
priv->ts_discont = FALSE;
}
dts = gst_segment_to_position (&priv->segment, GST_FORMAT_TIME, item->dts);
pts = gst_segment_to_position (&priv->segment, GST_FORMAT_TIME, item->pts);
/* apply timestamp with offset to buffer now */
GST_BUFFER_DTS (outbuf) = apply_offset (jitterbuffer, dts);
GST_BUFFER_PTS (outbuf) = apply_offset (jitterbuffer, pts);
/* update the elapsed time when we need to check against the npt stop time. */
update_estimated_eos (jitterbuffer, item);
priv->last_out_time = GST_BUFFER_PTS (outbuf);
} else {
outevent = item->data;
if (item->type == ITEM_TYPE_LOST) {
priv->discont = TRUE;
if (!priv->do_lost)
do_push = FALSE;
}
}
/* now we are ready to push the buffer. Save the seqnum and release the lock
* so the other end can push stuff in the queue again. */
priv->last_popped_seqnum = seqnum;
priv->next_seqnum = (seqnum + item->count) & 0xffff;
JBUF_UNLOCK (priv);
item->data = NULL;
free_item (item);
if (is_buffer) {
/* push buffer */
if (percent != -1)
post_buffering_percent (jitterbuffer, percent);
GST_DEBUG_OBJECT (jitterbuffer,
"Pushing buffer %d, dts %" GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT,
seqnum, GST_TIME_ARGS (GST_BUFFER_DTS (outbuf)),
GST_TIME_ARGS (GST_BUFFER_PTS (outbuf)));
result = gst_pad_push (priv->srcpad, outbuf);
} else {
GST_DEBUG_OBJECT (jitterbuffer, "Pushing event %d", seqnum);
if (do_push)
gst_pad_push_event (priv->srcpad, outevent);
else
gst_event_unref (outevent);
result = GST_FLOW_OK;
}
JBUF_LOCK_CHECK (priv, out_flushing);
return result;
/* ERRORS */
out_flushing:
{
return priv->srcresult;
}
}
#define GST_FLOW_WAIT GST_FLOW_CUSTOM_SUCCESS
/* Peek a buffer and compare the seqnum to the expected seqnum.
* If all is fine, the buffer is pushed.
* If something is wrong, we wait for some event
*/
static GstFlowReturn
handle_next_buffer (GstRtpJitterBuffer * jitterbuffer)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
GstFlowReturn result = GST_FLOW_OK;
RTPJitterBufferItem *item;
guint16 seqnum;
guint32 next_seqnum;
gint gap;
/* only push buffers when PLAYING and active and not buffering */
if (priv->blocked || !priv->active ||
rtp_jitter_buffer_is_buffering (priv->jbuf))
return GST_FLOW_WAIT;
again:
/* peek a buffer, we're just looking at the sequence number.
* If all is fine, we'll pop and push it. If the sequence number is wrong we
* wait for a timeout or something to change.
* The peeked buffer is valid for as long as we hold the jitterbuffer lock. */
item = rtp_jitter_buffer_peek (priv->jbuf);
if (item == NULL)
goto wait;
/* get the seqnum and the next expected seqnum */
seqnum = item->seqnum;
next_seqnum = priv->next_seqnum;
/* get the gap between this and the previous packet. If we don't know the
* previous packet seqnum assume no gap. */
if (G_UNLIKELY (next_seqnum == -1)) {
GST_DEBUG_OBJECT (jitterbuffer, "First buffer #%d", seqnum);
/* we don't know what the next_seqnum should be, the chain function should
* have scheduled a DEADLINE timer that will increment next_seqnum when it
* fires, so wait for that */
result = GST_FLOW_WAIT;
} else {
/* else calculate GAP */
gap = gst_rtp_buffer_compare_seqnum (next_seqnum, seqnum);
if (G_LIKELY (gap == 0)) {
/* no missing packet, pop and push */
result = pop_and_push_next (jitterbuffer, seqnum);
} else if (G_UNLIKELY (gap < 0)) {
RTPJitterBufferItem *item;
/* if we have a packet that we already pushed or considered dropped, pop it
* off and get the next packet */
GST_DEBUG_OBJECT (jitterbuffer, "Old packet #%d, next #%d dropping",
seqnum, next_seqnum);
item = rtp_jitter_buffer_pop (priv->jbuf, NULL);
free_item (item);
goto again;
} else {
/* the chain function has scheduled timers to request retransmission or
* when to consider the packet lost, wait for that */
GST_DEBUG_OBJECT (jitterbuffer,
"Sequence number GAP detected: expected %d instead of %d (%d missing)",
next_seqnum, seqnum, gap);
result = GST_FLOW_WAIT;
}
}
return result;
wait:
{
GST_DEBUG_OBJECT (jitterbuffer, "no buffer, going to wait");
if (priv->eos)
result = GST_FLOW_EOS;
else
result = GST_FLOW_WAIT;
return result;
}
}
/* the timeout for when we expected a packet expired */
static gboolean
do_expected_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
GstClockTime now)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
GstEvent *event;
guint delay;
GST_DEBUG_OBJECT (jitterbuffer, "expected %d didn't arrive", timer->seqnum);
delay = timer->rtx_delay + timer->rtx_retry;
event = gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM,
gst_structure_new ("GstRTPRetransmissionRequest",
"seqnum", G_TYPE_UINT, (guint) timer->seqnum,
"running-time", G_TYPE_UINT64, timer->rtx_base,
"delay", G_TYPE_UINT, GST_TIME_AS_MSECONDS (delay),
"retry", G_TYPE_UINT, timer->num_rtx_retry,
"frequency", G_TYPE_UINT, priv->rtx_retry_timeout,
"period", G_TYPE_UINT, priv->rtx_retry_period,
"deadline", G_TYPE_UINT, priv->latency_ms,
"packet-spacing", G_TYPE_UINT64, priv->packet_spacing, NULL));
priv->num_rtx_requests++;
timer->num_rtx_retry++;
timer->rtx_last = now;
JBUF_UNLOCK (priv);
gst_pad_push_event (priv->sinkpad, event);
JBUF_LOCK (priv);
/* calculate the timeout for the next retransmission attempt */
timer->rtx_retry += (priv->rtx_retry_timeout * GST_MSECOND);
GST_DEBUG_OBJECT (jitterbuffer, "base %" GST_TIME_FORMAT ", delay %"
GST_TIME_FORMAT ", retry %" GST_TIME_FORMAT,
GST_TIME_ARGS (timer->rtx_base), GST_TIME_ARGS (timer->rtx_delay),
GST_TIME_ARGS (timer->rtx_retry));
if (timer->rtx_retry + timer->rtx_delay >
(priv->rtx_retry_period * GST_MSECOND)) {
GST_DEBUG_OBJECT (jitterbuffer, "reschedule as LOST timer");
/* too many retransmission request, we now convert the timer
* to a lost timer, leave the num_rtx_retry as it is for stats */
timer->type = TIMER_TYPE_LOST;
timer->rtx_delay = 0;
timer->rtx_retry = 0;
}
reschedule_timer (jitterbuffer, timer, timer->seqnum,
timer->rtx_base + timer->rtx_retry, timer->rtx_delay, FALSE);
return FALSE;
}
/* a packet is lost */
static gboolean
do_lost_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
GstClockTime now)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
GstClockTime duration, timestamp;
guint seqnum, lost_packets, num_rtx_retry;
gboolean late;
GstEvent *event;
RTPJitterBufferItem *item;
seqnum = timer->seqnum;
timestamp = apply_offset (jitterbuffer, timer->timeout);
duration = timer->duration;
if (duration == GST_CLOCK_TIME_NONE && priv->packet_spacing > 0)
duration = priv->packet_spacing;
lost_packets = MAX (timer->num, 1);
late = timer->num > 0;
num_rtx_retry = timer->num_rtx_retry;
/* we had a gap and thus we lost some packets. Create an event for this. */
if (lost_packets > 1)
GST_DEBUG_OBJECT (jitterbuffer, "Packets #%d -> #%d lost", seqnum,
seqnum + lost_packets - 1);
else
GST_DEBUG_OBJECT (jitterbuffer, "Packet #%d lost", seqnum);
priv->num_late += lost_packets;
priv->num_rtx_failed += num_rtx_retry;
/* create paket lost event */
event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM,
gst_structure_new ("GstRTPPacketLost",
"seqnum", G_TYPE_UINT, (guint) seqnum,
"timestamp", G_TYPE_UINT64, timestamp,
"duration", G_TYPE_UINT64, duration,
"late", G_TYPE_BOOLEAN, late,
"retry", G_TYPE_UINT, num_rtx_retry, NULL));
item = alloc_item (event, ITEM_TYPE_LOST, -1, -1, seqnum, lost_packets, -1);
rtp_jitter_buffer_insert (priv->jbuf, item, NULL, NULL);
/* remove timer now */
remove_timer (jitterbuffer, timer);
JBUF_SIGNAL_EVENT (priv);
return TRUE;
}
static gboolean
do_eos_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
GstClockTime now)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
GST_INFO_OBJECT (jitterbuffer, "got the NPT timeout");
remove_timer (jitterbuffer, timer);
JBUF_SIGNAL_EVENT (priv);
return TRUE;
}
static gboolean
do_deadline_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
GstClockTime now)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
GST_INFO_OBJECT (jitterbuffer, "got deadline timeout");
priv->next_seqnum = timer->seqnum;
remove_timer (jitterbuffer, timer);
JBUF_SIGNAL_EVENT (priv);
return TRUE;
}
static gboolean
do_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
GstClockTime now)
{
gboolean removed = FALSE;
switch (timer->type) {
case TIMER_TYPE_EXPECTED:
removed = do_expected_timeout (jitterbuffer, timer, now);
break;
case TIMER_TYPE_LOST:
removed = do_lost_timeout (jitterbuffer, timer, now);
break;
case TIMER_TYPE_DEADLINE:
removed = do_deadline_timeout (jitterbuffer, timer, now);
break;
case TIMER_TYPE_EOS:
removed = do_eos_timeout (jitterbuffer, timer, now);
break;
}
return removed;
}
/* called when we need to wait for the next timeout.
*
* We loop over the array of recorded timeouts and wait for the earliest one.
* When it timed out, do the logic associated with the timer.
*
* If there are no timers, we wait on a gcond until something new happens.
*/
static void
wait_next_timeout (GstRtpJitterBuffer * jitterbuffer)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
GstClockTime now = 0;
JBUF_LOCK (priv);
while (priv->timer_running) {
TimerData *timer = NULL;
GstClockTime timer_timeout = -1;
gint i, len;
GST_DEBUG_OBJECT (jitterbuffer, "now %" GST_TIME_FORMAT,
GST_TIME_ARGS (now));
len = priv->timers->len;
for (i = 0; i < len; i++) {
TimerData *test = &g_array_index (priv->timers, TimerData, i);
GstClockTime test_timeout = get_timeout (jitterbuffer, test);
gboolean save_best = FALSE;
GST_DEBUG_OBJECT (jitterbuffer, "%d, %d, %d, %" GST_TIME_FORMAT,
i, test->type, test->seqnum, GST_TIME_ARGS (test_timeout));
/* find the smallest timeout */
if (timer == NULL) {
save_best = TRUE;
} else if (timer_timeout == -1) {
/* we already have an immediate timeout, the new timer must be an
* immediate timer with smaller seqnum to become the best */
if (test_timeout == -1 && test->seqnum < timer->seqnum)
save_best = TRUE;
} else if (test_timeout == -1) {
/* first immediate timer */
save_best = TRUE;
} else if (test_timeout < timer_timeout) {
/* earlier timer */
save_best = TRUE;
} else if (test_timeout == timer_timeout && test->seqnum < timer->seqnum) {
/* same timer, smaller seqnum */
save_best = TRUE;
}
if (save_best) {
GST_DEBUG_OBJECT (jitterbuffer, "new best %d", i);
timer = test;
timer_timeout = test_timeout;
}
}
if (timer && !priv->blocked) {
GstClock *clock;
GstClockTime sync_time;
GstClockID id;
GstClockReturn ret;
GstClockTimeDiff clock_jitter;
if (timer_timeout == -1 || timer_timeout <= now) {
do_timeout (jitterbuffer, timer, now);
/* check here, do_timeout could have released the lock */
if (!priv->timer_running)
break;
continue;
}
GST_OBJECT_LOCK (jitterbuffer);
clock = GST_ELEMENT_CLOCK (jitterbuffer);
if (!clock) {
GST_OBJECT_UNLOCK (jitterbuffer);
/* let's just push if there is no clock */
GST_DEBUG_OBJECT (jitterbuffer, "No clock, timeout right away");
now = timer_timeout;
continue;
}
/* prepare for sync against clock */
sync_time = timer_timeout + GST_ELEMENT_CAST (jitterbuffer)->base_time;
/* add latency of peer to get input time */
sync_time += priv->peer_latency;
GST_DEBUG_OBJECT (jitterbuffer, "sync to timestamp %" GST_TIME_FORMAT
" with sync time %" GST_TIME_FORMAT,
GST_TIME_ARGS (timer_timeout), GST_TIME_ARGS (sync_time));
/* create an entry for the clock */
id = priv->clock_id = gst_clock_new_single_shot_id (clock, sync_time);
priv->timer_timeout = timer_timeout;
priv->timer_seqnum = timer->seqnum;
GST_OBJECT_UNLOCK (jitterbuffer);
/* release the lock so that the other end can push stuff or unlock */
JBUF_UNLOCK (priv);
ret = gst_clock_id_wait (id, &clock_jitter);
JBUF_LOCK (priv);
if (!priv->timer_running)
break;
if (ret != GST_CLOCK_UNSCHEDULED) {
now = timer_timeout + MAX (clock_jitter, 0);
GST_DEBUG_OBJECT (jitterbuffer, "sync done, %d, #%d, %" G_GINT64_FORMAT,
ret, priv->timer_seqnum, clock_jitter);
} else {
GST_DEBUG_OBJECT (jitterbuffer, "sync unscheduled");
}
/* and free the entry */
gst_clock_id_unref (id);
priv->clock_id = NULL;
} else {
/* no timers, wait for activity */
JBUF_WAIT_TIMER (priv);
}
}
JBUF_UNLOCK (priv);
GST_DEBUG_OBJECT (jitterbuffer, "we are stopping");
return;
}
/*
* This funcion implements the main pushing loop on the source pad.
*
* It first tries to push as many buffers as possible. If there is a seqnum
* mismatch, we wait for the next timeouts.
*/
static void
gst_rtp_jitter_buffer_loop (GstRtpJitterBuffer * jitterbuffer)
{
GstRtpJitterBufferPrivate *priv;
GstFlowReturn result;
priv = jitterbuffer->priv;
JBUF_LOCK_CHECK (priv, flushing);
do {
result = handle_next_buffer (jitterbuffer);
if (G_LIKELY (result == GST_FLOW_WAIT)) {
/* now wait for the next event */
JBUF_WAIT_EVENT (priv, flushing);
result = GST_FLOW_OK;
}
}
while (result == GST_FLOW_OK);
JBUF_UNLOCK (priv);
/* if we get here we need to pause */
goto pause;
/* ERRORS */
flushing:
{
result = priv->srcresult;
JBUF_UNLOCK (priv);
goto pause;
}
pause:
{
const gchar *reason = gst_flow_get_name (result);
GstEvent *event;
GST_DEBUG_OBJECT (jitterbuffer, "pausing task, reason %s", reason);
gst_pad_pause_task (priv->srcpad);
if (result == GST_FLOW_EOS) {
event = gst_event_new_eos ();
gst_pad_push_event (priv->srcpad, event);
}
return;
}
}
/* collect the info from the lastest RTCP packet and the jitterbuffer sync, do
* some sanity checks and then emit the handle-sync signal with the parameters.
* This function must be called with the LOCK */
static void
do_handle_sync (GstRtpJitterBuffer * jitterbuffer)
{
GstRtpJitterBufferPrivate *priv;
guint64 base_rtptime, base_time;
guint32 clock_rate;
guint64 last_rtptime;
guint64 clock_base;
guint64 ext_rtptime, diff;
gboolean drop = FALSE;
priv = jitterbuffer->priv;
/* get the last values from the jitterbuffer */
rtp_jitter_buffer_get_sync (priv->jbuf, &base_rtptime, &base_time,
&clock_rate, &last_rtptime);
clock_base = priv->clock_base;
ext_rtptime = priv->ext_rtptime;
GST_DEBUG_OBJECT (jitterbuffer, "ext SR %" G_GUINT64_FORMAT ", base %"
G_GUINT64_FORMAT ", clock-rate %" G_GUINT32_FORMAT
", clock-base %" G_GUINT64_FORMAT ", last-rtptime %" G_GUINT64_FORMAT,
ext_rtptime, base_rtptime, clock_rate, clock_base, last_rtptime);
if (base_rtptime == -1 || clock_rate == -1 || base_time == -1) {
GST_DEBUG_OBJECT (jitterbuffer, "dropping, no RTP values");
drop = TRUE;
} else {
/* we can't accept anything that happened before we did the last resync */
if (base_rtptime > ext_rtptime) {
GST_DEBUG_OBJECT (jitterbuffer, "dropping, older than base time");
drop = TRUE;
} else {
/* the SR RTP timestamp must be something close to what we last observed
* in the jitterbuffer */
if (ext_rtptime > last_rtptime) {
/* check how far ahead it is to our RTP timestamps */
diff = ext_rtptime - last_rtptime;
/* if bigger than 1 second, we drop it */
if (diff > clock_rate) {
GST_DEBUG_OBJECT (jitterbuffer, "too far ahead");
/* should drop this, but some RTSP servers end up with bogus
* way too ahead RTCP packet when repeated PAUSE/PLAY,
* so still trigger rptbin sync but invalidate RTCP data
* (sync might use other methods) */
ext_rtptime = -1;
}
GST_DEBUG_OBJECT (jitterbuffer, "ext last %" G_GUINT64_FORMAT ", diff %"
G_GUINT64_FORMAT, last_rtptime, diff);
}
}
}
if (!drop) {
GstStructure *s;
s = gst_structure_new ("application/x-rtp-sync",
"base-rtptime", G_TYPE_UINT64, base_rtptime,
"base-time", G_TYPE_UINT64, base_time,
"clock-rate", G_TYPE_UINT, clock_rate,
"clock-base", G_TYPE_UINT64, clock_base,
"sr-ext-rtptime", G_TYPE_UINT64, ext_rtptime,
"sr-buffer", GST_TYPE_BUFFER, priv->last_sr, NULL);
GST_DEBUG_OBJECT (jitterbuffer, "signaling sync");
gst_buffer_replace (&priv->last_sr, NULL);
JBUF_UNLOCK (priv);
g_signal_emit (jitterbuffer,
gst_rtp_jitter_buffer_signals[SIGNAL_HANDLE_SYNC], 0, s);
JBUF_LOCK (priv);
gst_structure_free (s);
} else {
GST_DEBUG_OBJECT (jitterbuffer, "dropping RTCP packet");
}
}
static GstFlowReturn
gst_rtp_jitter_buffer_chain_rtcp (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstRtpJitterBuffer *jitterbuffer;
GstRtpJitterBufferPrivate *priv;
GstFlowReturn ret = GST_FLOW_OK;
guint32 ssrc;
GstRTCPPacket packet;
guint64 ext_rtptime;
guint32 rtptime;
GstRTCPBuffer rtcp = { NULL, };
jitterbuffer = GST_RTP_JITTER_BUFFER (parent);
if (G_UNLIKELY (!gst_rtcp_buffer_validate (buffer)))
goto invalid_buffer;
priv = jitterbuffer->priv;
gst_rtcp_buffer_map (buffer, GST_MAP_READ, &rtcp);
if (!gst_rtcp_buffer_get_first_packet (&rtcp, &packet))
goto empty_buffer;
/* first packet must be SR or RR or else the validate would have failed */
switch (gst_rtcp_packet_get_type (&packet)) {
case GST_RTCP_TYPE_SR:
gst_rtcp_packet_sr_get_sender_info (&packet, &ssrc, NULL, &rtptime,
NULL, NULL);
break;
default:
goto ignore_buffer;
}
gst_rtcp_buffer_unmap (&rtcp);
GST_DEBUG_OBJECT (jitterbuffer, "received RTCP of SSRC %08x", ssrc);
JBUF_LOCK (priv);
/* convert the RTP timestamp to our extended timestamp, using the same offset
* we used in the jitterbuffer */
ext_rtptime = priv->jbuf->ext_rtptime;
ext_rtptime = gst_rtp_buffer_ext_timestamp (&ext_rtptime, rtptime);
priv->ext_rtptime = ext_rtptime;
gst_buffer_replace (&priv->last_sr, buffer);
do_handle_sync (jitterbuffer);
JBUF_UNLOCK (priv);
done:
gst_buffer_unref (buffer);
return ret;
invalid_buffer:
{
/* this is not fatal but should be filtered earlier */
GST_ELEMENT_WARNING (jitterbuffer, STREAM, DECODE, (NULL),
("Received invalid RTCP payload, dropping"));
ret = GST_FLOW_OK;
goto done;
}
empty_buffer:
{
/* this is not fatal but should be filtered earlier */
GST_ELEMENT_WARNING (jitterbuffer, STREAM, DECODE, (NULL),
("Received empty RTCP payload, dropping"));
gst_rtcp_buffer_unmap (&rtcp);
ret = GST_FLOW_OK;
goto done;
}
ignore_buffer:
{
GST_DEBUG_OBJECT (jitterbuffer, "ignoring RTCP packet");
gst_rtcp_buffer_unmap (&rtcp);
ret = GST_FLOW_OK;
goto done;
}
}
static gboolean
gst_rtp_jitter_buffer_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
gboolean res = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = gst_rtp_jitter_buffer_getcaps (pad, filter);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
break;
}
default:
if (GST_QUERY_IS_SERIALIZED (query)) {
GST_WARNING_OBJECT (pad, "unhandled serialized query");
res = FALSE;
} else {
res = gst_pad_query_default (pad, parent, query);
}
break;
}
return res;
}
static gboolean
gst_rtp_jitter_buffer_src_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
GstRtpJitterBuffer *jitterbuffer;
GstRtpJitterBufferPrivate *priv;
gboolean res = FALSE;
jitterbuffer = GST_RTP_JITTER_BUFFER (parent);
priv = jitterbuffer->priv;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:
{
/* We need to send the query upstream and add the returned latency to our
* own */
GstClockTime min_latency, max_latency;
gboolean us_live;
GstClockTime our_latency;
if ((res = gst_pad_peer_query (priv->sinkpad, query))) {
gst_query_parse_latency (query, &us_live, &min_latency, &max_latency);
GST_DEBUG_OBJECT (jitterbuffer, "Peer latency: min %"
GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
/* store this so that we can safely sync on the peer buffers. */
JBUF_LOCK (priv);
priv->peer_latency = min_latency;
our_latency = priv->latency_ns;
JBUF_UNLOCK (priv);
GST_DEBUG_OBJECT (jitterbuffer, "Our latency: %" GST_TIME_FORMAT,
GST_TIME_ARGS (our_latency));
/* we add some latency but can buffer an infinite amount of time */
min_latency += our_latency;
max_latency = -1;
GST_DEBUG_OBJECT (jitterbuffer, "Calculated total latency : min %"
GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
gst_query_set_latency (query, TRUE, min_latency, max_latency);
}
break;
}
case GST_QUERY_POSITION:
{
GstClockTime start, last_out;
GstFormat fmt;
gst_query_parse_position (query, &fmt, NULL);
if (fmt != GST_FORMAT_TIME) {
res = gst_pad_query_default (pad, parent, query);
break;
}
JBUF_LOCK (priv);
start = priv->npt_start;
last_out = priv->last_out_time;
JBUF_UNLOCK (priv);
GST_DEBUG_OBJECT (jitterbuffer, "npt start %" GST_TIME_FORMAT
", last out %" GST_TIME_FORMAT, GST_TIME_ARGS (start),
GST_TIME_ARGS (last_out));
if (GST_CLOCK_TIME_IS_VALID (start) && GST_CLOCK_TIME_IS_VALID (last_out)) {
/* bring 0-based outgoing time to stream time */
gst_query_set_position (query, GST_FORMAT_TIME, start + last_out);
res = TRUE;
} else {
res = gst_pad_query_default (pad, parent, query);
}
break;
}
case GST_QUERY_CAPS:
{
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = gst_rtp_jitter_buffer_getcaps (pad, filter);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
break;
}
default:
res = gst_pad_query_default (pad, parent, query);
break;
}
return res;
}
static void
gst_rtp_jitter_buffer_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstRtpJitterBuffer *jitterbuffer;
GstRtpJitterBufferPrivate *priv;
jitterbuffer = GST_RTP_JITTER_BUFFER (object);
priv = jitterbuffer->priv;
switch (prop_id) {
case PROP_LATENCY:
{
guint new_latency, old_latency;
new_latency = g_value_get_uint (value);
JBUF_LOCK (priv);
old_latency = priv->latency_ms;
priv->latency_ms = new_latency;
priv->latency_ns = priv->latency_ms * GST_MSECOND;
rtp_jitter_buffer_set_delay (priv->jbuf, priv->latency_ns);
JBUF_UNLOCK (priv);
/* post message if latency changed, this will inform the parent pipeline
* that a latency reconfiguration is possible/needed. */
if (new_latency != old_latency) {
GST_DEBUG_OBJECT (jitterbuffer, "latency changed to: %" GST_TIME_FORMAT,
GST_TIME_ARGS (new_latency * GST_MSECOND));
gst_element_post_message (GST_ELEMENT_CAST (jitterbuffer),
gst_message_new_latency (GST_OBJECT_CAST (jitterbuffer)));
}
break;
}
case PROP_DROP_ON_LATENCY:
JBUF_LOCK (priv);
priv->drop_on_latency = g_value_get_boolean (value);
JBUF_UNLOCK (priv);
break;
case PROP_TS_OFFSET:
JBUF_LOCK (priv);
priv->ts_offset = g_value_get_int64 (value);
priv->ts_discont = TRUE;
JBUF_UNLOCK (priv);
break;
case PROP_DO_LOST:
JBUF_LOCK (priv);
priv->do_lost = g_value_get_boolean (value);
JBUF_UNLOCK (priv);
break;
case PROP_MODE:
JBUF_LOCK (priv);
rtp_jitter_buffer_set_mode (priv->jbuf, g_value_get_enum (value));
JBUF_UNLOCK (priv);
break;
case PROP_DO_RETRANSMISSION:
JBUF_LOCK (priv);
priv->do_retransmission = g_value_get_boolean (value);
JBUF_UNLOCK (priv);
break;
case PROP_RTX_DELAY:
JBUF_LOCK (priv);
priv->rtx_delay = g_value_get_int (value);
JBUF_UNLOCK (priv);
break;
case PROP_RTX_DELAY_REORDER:
JBUF_LOCK (priv);
priv->rtx_delay_reorder = g_value_get_int (value);
JBUF_UNLOCK (priv);
break;
case PROP_RTX_RETRY_TIMEOUT:
JBUF_LOCK (priv);
priv->rtx_retry_timeout = g_value_get_int (value);
JBUF_UNLOCK (priv);
break;
case PROP_RTX_RETRY_PERIOD:
JBUF_LOCK (priv);
priv->rtx_retry_period = g_value_get_int (value);
JBUF_UNLOCK (priv);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_jitter_buffer_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstRtpJitterBuffer *jitterbuffer;
GstRtpJitterBufferPrivate *priv;
jitterbuffer = GST_RTP_JITTER_BUFFER (object);
priv = jitterbuffer->priv;
switch (prop_id) {
case PROP_LATENCY:
JBUF_LOCK (priv);
g_value_set_uint (value, priv->latency_ms);
JBUF_UNLOCK (priv);
break;
case PROP_DROP_ON_LATENCY:
JBUF_LOCK (priv);
g_value_set_boolean (value, priv->drop_on_latency);
JBUF_UNLOCK (priv);
break;
case PROP_TS_OFFSET:
JBUF_LOCK (priv);
g_value_set_int64 (value, priv->ts_offset);
JBUF_UNLOCK (priv);
break;
case PROP_DO_LOST:
JBUF_LOCK (priv);
g_value_set_boolean (value, priv->do_lost);
JBUF_UNLOCK (priv);
break;
case PROP_MODE:
JBUF_LOCK (priv);
g_value_set_enum (value, rtp_jitter_buffer_get_mode (priv->jbuf));
JBUF_UNLOCK (priv);
break;
case PROP_PERCENT:
{
gint percent;
JBUF_LOCK (priv);
if (priv->srcresult != GST_FLOW_OK)
percent = 100;
else
percent = rtp_jitter_buffer_get_percent (priv->jbuf);
g_value_set_int (value, percent);
JBUF_UNLOCK (priv);
break;
}
case PROP_DO_RETRANSMISSION:
JBUF_LOCK (priv);
g_value_set_boolean (value, priv->do_retransmission);
JBUF_UNLOCK (priv);
break;
case PROP_RTX_DELAY:
JBUF_LOCK (priv);
g_value_set_int (value, priv->rtx_delay);
JBUF_UNLOCK (priv);
break;
case PROP_RTX_DELAY_REORDER:
JBUF_LOCK (priv);
g_value_set_int (value, priv->rtx_delay_reorder);
JBUF_UNLOCK (priv);
break;
case PROP_RTX_RETRY_TIMEOUT:
JBUF_LOCK (priv);
g_value_set_int (value, priv->rtx_retry_timeout);
JBUF_UNLOCK (priv);
break;
case PROP_RTX_RETRY_PERIOD:
JBUF_LOCK (priv);
g_value_set_int (value, priv->rtx_retry_period);
JBUF_UNLOCK (priv);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
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